"What happens if the USN A-12 Avenger enters service and how might that come about?"
The USN has to be serious about funding the program, from the start, as a Navy only effort. And specifically has to FIRE with prejudice the Navy Lawyer, Margaret Olsen, who advised the withholding of key weight overages in the MDD/GD estimates as a 'chinning bar' which would be used to force the companies to accept lower post-development service costs. Along with the flat out lie that Northrop was still in the competition, this forced the MDD/GD team to effectively bid against themselves, without knowing it, and creating the long term certainty of default which the Government is not allowed to do because the cost of a failed competition which you caused to be underbid is a deficiency which will only have to be made up as you rerole the dice on a followon effort.
You should probably also remove John Lehman from office as SecNav as he deliberately slow rolled the program, hoping to 'await further notice' from the results of the ATF and ATB programs before committing the Navy to stealth airpower, so he could build his Big Fleet.
Unknown to him, this led the entire concept formulation and development to be done, essentially, at business expense which is ALSO a breaking of the fundamental DFAR on 'buying in' (investing own-funds without contract to develop technology studies) as an act which often leads nowhere, eats the bottom line on extant programs and leads to starting in the hole as promises are made on technologies which might prove risky, solely on the basis of getting back the money spent on initial analysis of those capabilities (from within industry), in the hopes of integrating them. If internal carriage, stealth and multi-sensor integration are all big risks but promoted as TRL4-5-6 (partly developed) the sticker shock of bringing them together can lead to cancellation of a perfectly good system which is simply costed beyond reasonable fleet buy.
At a fundamental level, this means dividing up the program into airframe, stealth, avionics and flying qualities/carrier suitability testing phases with go-nogo restrictors on things like the flying wing and <.0001m2 RCS pushing secondary reductions in the 'why a tailless wing on a carrier?' configuration. One of the alternate designs was a supersonic, agile and fully empennaged airframe, lookign like a cross between the F-14 and F-111. If you cannot afford naval VLO and/or you cannot make it compatible with a marine corrosion environment, it's time to consider alternatives, like cheap standoff munitions and reduced rather than very low observables in the .1 to 1m2 range.
Basically, you're looking for realistic funding plans verify the major technology baselines as high risk areas before committing to what amounts to concurrent design and manufacturing preparation. Realistically, this is not a 1990s serviced airframe but a 2000s design which means further cost incrementation via the A-6F/G and F-14D ST21 are almost a given.
_If you are committed to that_, then you need to back out of the NATF program and concentrate on cost effective upgrades to the extant force, termination of the short range hornet program early on, and full pre-production testbed and FSED flight test expansion of funding for your new jet. This also means having a MENS/COEA as both cost driver and doctrinal stand to arrangement to integrate a given X number of jets into the airwing.
"Could this require a different design?"
The A-12 is being lied about at some rather fundamental levels. As described, it has too many optimizations for high altitude flight not to be stealthy and is too slow and lacking in performance at these levels, to be survivable if caught. At 1,308 square feet of wing area, it certainly has the lift to reach decent heights but needs engines in the F414 or F100 class (16-18,000lbf, per side) to be reasonably energy maneuvering SEP capable in the 20-30,000ft band.
And such performance incrementation is indicated here-
In both the presence of a large RAM 'stealth bra' described in _The Five Billion Dollar Misunderstanding_ by Stevenson as being fitted to the leading edge of the wing and the much large (higher mass flow) intakes of a new engine which supposedly did a great deal to raise speeds and climb rates at all levels. All of which would indicate a different kind of airframe from that of the mockup.
Since GD had a decent VLO office and had run tests on the Model 100/Cold Pigeon which had a notable kink in the trailing edge, it is hard to explain why this was not adopted for the A-12. One can only say that multiple officers have stated that one of the type's major failings was its large emphasis upon VLO and the weight/costs involved which, at the time, correspond to the call-back (over a Fourth of July weekend) in1986 by the head of the F-22 SPO with a 'scrap everything, clean sheet, we have a new design threshold' imperative which took the Lockheed design from an F/A-18/Su-27 hybrid to upside down F-117 it is today.
Something changed in the mid 1980s which made VLO possible without swoopy curves and perfect planform alignment and whatever material or system (active cancellation) effect it was, it completely altered the F-22 program. So why not the A-12?
"Does the USN have to change requirements?"
I would suggest not. One of the great achievements of the A-12 program was the stated desire to carry 16 Mk.82 (7ft long), 8 Mk.83 (10ft long) or 4 Mk.84 class munitions (12ft long) as well as paired self defense weapons. This ability to carry multiples of heavyweight munitions would rapidly become important with the arrival of the JDAM and dedicated munitions like the GAM-36/37 and GBU-28. Today it is crucial to the internal carriage of systems like PL-17 and AIM-174B as well as nascent hypersonic munitions like HALO and HACM.
And these munitions would be needed because systems like the Kh-80/90 series were on the towards
Having said this, the nature of the flying wing without global, very high -dbsm, RCS reductions, is one of overly complicated platform design which is going to be difficult to bring aboard as both a flying airframe without no lateral stabilization and a 70ft wingspan one.
If it is necessary to modify the trailing edge to gain VLO at the cost of trailing edge stiffness and/or control effectivness withiin a differential movement scheme for sideslip and yaw control, then signature may compromise carrier suitability. The Rafale solves this problem by installing saw tooth boundaries at the back of a fairly conventional wing which stop surface wave returns from the straight TE but how much this kind of attenuation will effect particularly non fire control band radars is unknowable. Similarly internal saw tooths, built into a dielectric (flight) control system may also not prove sufficient in reducing direct path returns. But it is possible that the 'Stealth Bra' would do this, given it is an active leading edge cancellation system.
"What's the effects of having a LO Attack platform entering service in the late 90's to early 2000's?"
Standardization of the Carrier airwings around two jets per deck. Both optimized towards very long range strike and both likely small enough to be stowed entirely below decks when not in active flight operations.
The F-14D Super Tomcat 21 will become the universal fighter with AIM-152 AAAM as the normative LRM and the wings qualified to HARM/AARGM and AIM-9X/AIM-120. With the latter adoping an active, anti-missile, role. And a new, digital, AESA completely replacing the dated APG-71 hardware baselines which are, in fact, still those of the AWG-9, completely with analogue front end.
Some airwings will standardize on the A-6F/G and ST-21 and some on the A-12 and ST-21. With GTW surge taken up by USMC airframes. The lead decks will be door kickers and all airframes will be using standoff glide/boosted/cruise munitions as standard. Probably based on Tacit Rainbow or ITALD class munitions at first and supersonic MALD later (30,000 dollars each).
With munitions like (ATC/ATR capable) SLAM-ER and eventually MMTD-as-SDB being adopted, fleet wide, the doctrinal threshold for penetration will change from securing the far side of the mission area with TARCAP/BARCAP presence to maintain safe BRLs of some 40-90nm standoff, short of the target.
"How does this affect the CALF-JAST-JSF effort?"
The USAF wants the F-22 and is willing to multi-role it as a function of followon B/C models. They adopt an early form of the F-35 'baked right in' RAM system (which in fact does exist, on the last 40 or so airframes) as the production standard and improve from there, across models and blocks instead of 'spirals' which took a decade to fit AIM-9X and still hasn't managed to integrate an HMDS or IRST.
They will probably adopt a stretched version by the C or E model to allow for AMRAAM in the side bays or go for a SACM level (Cuda/Peregrine) mini-missile which is essentially half-RAAM. The former gives them the option for a bulged weapons bay for strike payloads, the latter means you can actually close off the side bays and increase internal fuel to provide for a genuine 800nm radius, half at supercruise.
The alternative is to shut down Lockheed altogether and go with the generally superior YF-23 option with it's inherently longer weapons bay/s.
With this as your program of record throughout the later 90s and mid 2010s (no YF-22 crash) it becomes impossible, fiscally, to think of a followon to the F-16/18 before 2020 as the Tacair Trainwreck is simply not allowed to happen. At that point, UCAVs should be the obvious superior choice, as indeed they were in 2003 when we cancelled the J-UCAS, 'there but for hubris and manned force union shop rules'.
All services make fleet size and per-year build rate trades to keep the joint programs healthy and the utility of these programs in places like SWAPR is such that the emphasis upon 'lightweight' fighters goes away as we discover we don't need as much permission to base-in tankers to support 350nm radius teen series jets. By 2010, the outcomes of the DARPS UDS/UOS pretty much highlight the superiority of the UCAV with geared turbine in all roles requiring micro-munitions (JCM, LOCAAS/LOCATM and below) as effectively cruise missiles with landing gear in missions like TEL hunting and specifically as the counter to the rising threat of ASCM/ASBM.
With the collapse of the Soviet Union, Chinese A2AD becomes obvious and there is no money for a CSA to give one third of the airwing a survivable LO tanker. So again, _for awhile_, the combat range of the A-12 and F-14E becomes quite popular as a sortie generator.
If 9-11 happens, J-UCAS is not cancelled because, with the A-12 and F-22 firmly in production, the superiority of the UCAV as a GWOT hang-time bomber is just too obvious to ignore. The question then being how many are acquired of the VLO model as companions/lead scouts for the manned stealths and how many of a more affordable day-CAS/OBAS equivalent when RFLO is not as advantageous.
"Or affect the F/A-18E/F Super Hornet?"
Never built. As good riddance to bad trash. The first but sadly not the last fighter acquired despite having utterly failed OPEVAL, across multiple KPPs.
"If the RAF buy into this, does this affect the CVF debate?"
The UK needs to stop pretending they are a major power and not a nuclear armed microstate, like Israel. When your total size is roughly that of Montana and you have chosen to import a low function, high fertility, high crime rate, permanent welfare class, rather than encourage your own to have more kids or take in the multiple refugees of Communist Eastern Europe, then you have bigger problems than pretending to be something you are not, and have not been since 1956, at least.
If the RN wanted an effective OOTW platform then they should have bought into more Albion/Bulwark/Ocean class ships with micro-crewing like a civilian container ship and upload capable military TEU systems which missionized the vessel towards a command and control, hospital or LIMITED (by the range of Merlin helicopter lift and lack of a well deck) special operations capabilities. This would have allowed for a much more realistic multirole airdefense and ASW/Strike configured escort group, at least twice the size of today's Type 45 and Type 26 classes.
The problem with a carrier is that it is simply to high value, even with a stealth airwing to be brought in close. And the 460nm range of the F-35B is actually closer to 250nm when carrying useful external loads. It is not survivable on it's own. And without the added costs of a CATOBAR AEW&C plus Tankers plus ASW, it is a one trick pony for a threat which doesn't exist. You are not going to be hit by Bettys and Nells in the Gulf of Siam.
It will be hidden coastal and inland ASCM/ASBM which ICD you from 400-800nm (or more, DF-26B is a 2,500nm ranged weapon) batteries and against that threat a handful of fighters is not going to suffice while, again, the lack of proper CATOBAR facilities robs you of the secondary mission airframes which could (Outlaw Viking, A-47 UCAS-N, etc.).
Britain cannot crew her carriers. Cannot afford the 138 F-35Bs needed to give them a full deckload plus rotating spares. If Britain feels a need to be offensively projecting power, they need a 5,000nm stealth HALE UCAV and a bunch of cheap nuclear subs, possibly unmanned in a mixed SSN/UUV fleet configuration, to launch super and hypersonic missiles along the lines of the CVS.401.
Again, why you would want to do this when you have been jettisoned by the U.S. and are not a member of the EU is hard to say.
You are not, best case, in any way, capable of taking on Russia or China and the billions which Starmer et al have given as anti-biotics to the dying whale that is Ukraine have completely scuttled the UK defense sector, for at least a decade. You will be lucky to maintain GCAP as an export option with Japan and Spain.
Who else would buy into the system?
Japan?
South Korea?
Israel?
Germany?
Crazy notion but might the MN want it over the Rafale?
Stealth is a door kicker force. An FPA (Force Protection Asset) and a high value, deep strike, capability for in-extremis intervention in something like another Pakistan/India war where the nuclear threshold had been breached.
It should not have been exported. It should not have been proliferated.
It has more power as a bogeyman than an asset which countries by a tech sample of so they can then turn around and produce their own versions of as FCAS and GCAP.
This applies especially to France where Macron himself ran his hands down the side of an F-35 or F-22 then went to a special wash location and had the residue of the skins scrubbed off as a sample.
NATO should not profit from selling second generation U.S. ideas 'cheaper and easier' when they cannot even meet their threshold payment levels for maintaining the Alliance. And while we are there, Europe is a culture grouping of some 800 million people. Nearly all of whom are richer than the average U.S. middle class family. Even at 1% funding thresholds, a unified European armed forces, operating under EU combined command and control, should be able to DWARF the technological and capacity levels of the U.S.. Not least because they are already there and have limited, out of area, requirements.
The only reason Europe did not have stealth out of the Lampyridae effort was because everyone wanted to vamp the U.S. rather than cooperate with the Germans.
Would the A-12 have a relevant role in a high density, European, threat environment? Not without a lot of escorts as roll back.
Naval Strike gets to choose where and when it goes feet dry and it has an entire constellation of supporting assets as AEW, EW, and Tanking, built into the airwing constellation.
Unless you buy into the full package, you are not getting in and out, certainly not without standoff ordnance like multiple Storm Shadow or KEDP-350.
I would not sell boot laces to Israel, given their hubris in selling on anything we give them to the likes of China (J-10, Patriot, both resulting in their ambassador being called to carpet on and forced to apologize for, in the Oval Office) and they have the added problem of literally being unable to secure their airbases against guided missile strikes while, in daylight, you would have the option of flying through the MPAD/SHORAD/AAA (IIR/EOCG/57mm) threat envelope. Or trying to fly over the contrail band, using the built in suppressor system which is incredibly caustic. The IDFAF have seemingly abandoned subsonic cruise for high supersonic/hypersonic weapons options and these also appear to be too large for even the cavernous weapons bays of the A-12 to internally carry.
South Korea is Israel writ large, with nuclear weapons, inside 200nm though the nature of the peninsula actually favors a low-slow penetrator, able to reach NK targets with their version of the KEPD. If winning the war means preemption and/or pull back (ROKAF to Hokkaido) then the system could theoretically be useful, through to the 2040 period. But not more so than the Korean's own efforts to create GLCM/GLBM as mobile TEL platforms, able to play whackamole with a nuclear threat until PGS could put a single Trident onto Pyongyang.
Germany with the Avenger II could theoretically backstop Poland in a rush to defend Ukraine as Russia crossed the Dnieper, took Kiev and moved on Lvov. However; this would only last until Orezhnik brought multiple micro-MRIV PBV clusters down onto both German airbases and the Polish Aegis Ashore.
At that point, the USAF tanking and potentially nuclear umbrella comes into play as a 'We told ya so!' response to an emergency declared NATOization of a Ukrainian rump. This rapidly goes nuclear behind Iskander and Kh-102 and the world roasts though, again, if you are so stupid as to stick with B61 as a free fall munition rather than a MAKO-as-SRAM-3 the A-12 may give you the penetration which an F-35 (radius) or Tornado (radius plus signature) cannot, from a sufficiently wide set of dispersal fields to be survivable for 1-2 strikes.
One of the many mysteries of the A-12 is how it miraculously regained top end and cruise speeds, climb rate and particularly SEROC, after shifting to the 'fat wing' version. This almost demands a PW7000 or GE F414 level core upgrade and would have made the A-12 a 520-550 knot penetrator at low level and Mach .9 capable through the tropopause. Just as importantly, it (reportedly) pushed the combat radius back towards 1,000nm which should have been the baseline for an A-6 replacement.
Unfortunately, technology and operating theater shifts do catch up with even stealth and combinations of Chinese SOSUS systems, hooked into the telecomms cable network. WZ-8 supersonic drone and WZ-9 radar HALE plus Luditance SBR (either independently or in some kind of PCLS, bistatic, mode), along with the 80+ Yaogan IMINT satellites which China has (along with five active launch sites, able to rapidly insert replacements into any orbital track), have more or less turned the SCS into a gold fish bowl with 10-20 minute refresh cycles. Which China can saturate with 35-50 million dollar ASBMs from any of three generations: 800nm DF-21D, 1,300nm DF-17 and 2,500nm DF-26. Even before turning to subs, bombers and surface combatants with 200-300nm YJ-18, 250nm YJ-12 and 800nm YJ-21.
Best case, we stay in the far littorals and survive a few days, until the SM-3/SM-6 run out. Worst case, it doesn't matter because Chine uses air landed forces to avoid the Seelowe problems of predictable invasion force build up, seizing Kaohsiung and Taoyuan IAs as APODs to bring in huge numbers of airlanded forces (40,000 men, vs. 10,000 Marines) and then trundles off down the road to Keelung or Kaohsiung harbors to accept the first of several ROROs which, civilian registered under legitimate sail plans, pull into the SPOD. All within 2-4hrs.
This happening behind a wall of J-20s and tactical ballistic missiles as long range MRL strikes to flatten the ROCAF and HiMADS systems gives them absolute air supremacy before we can kick the marines out of Naha and the 7th fleet CSG out of Yokosuka.
At which point, China essentially pulls a Russia and says: 'Anything entering the operational exclusion area will be nuked.' As the 2-3 CSGs of the PLAN pull into the Black Ditch to provide a solid air defense corridor for Chinese heavy lift Y-20s to continually bring in more and more assets.
It's all fate d'accompli from that point. And flying subsonic intruders, even from 900nm out is not going to give you the DPI per day to make it safe for that carrier to come closer (or the fleet trains to sustain air operations until the Surge Force gets there, 1-2 weeks out, from San Diego...).
To win that, instant-on, fight requires the ability to prosecute a thousand aimpoints, with 4-7 million dollar missiles from 2-3 SSGN submarines, using relays of HALE ELO platforms, AAR capable, and staging out of Malaysia or Australia. Along the lines of an RQ-180. As well as special operations forces on-island.
In a foolishly air-not-missile power dominated U.S. service hierarchy, that shift towards 'cheaper, faster, further' with 400ft of seawater armor, is simply not going to be practical as a real counter to the ICD threat.
Ultimately, you're going to win a modern air war with hypersonic strike platforms that can launch from JBER and recover into Diego or from Darwin, dropping down into Al Udeid. With a Mach 10-15 cruse and flinging HGV like skipped stones over a time zone out from the industrial base which both supports the war and enables the economy. The days of sneakum-reel-gude, slow stealth, at anything like tactical air power distances are over.
They were questionable in the 1929-32 time frame when various Fleet Problems showed that carriers which hugged coastlines to get surprise strikes ended up scoring a couple serious hits before much longer ranging, multi-field capable bombers ran them down and sunk them. They were rendered more questionable in August 1945. Became increasingly unsustainable with the development of the Tsirkon predecessor Kh-80/90. And were utterly extinguished when Orezhnik showed that, Yes Virginia, Santa Clause can come down the chimney at Mach 10 to score precision present hits with 30+ micro MIRVs and they make a right mess of everything.
To the extent that the last Fleet Problem exercise in 2019, just before COVID shut everything down, had the USN 'winning' only by remaining east of Guam as part of a composite missile shield for the islands' long range bomber/CABS strike force.
Without the hang time and absolute radius/altitude advantages of a UCAV and given the enormous costs of naval stealth, the subsonic strike option is simply not practical either in terms of ISR targets generated, DPIs struck per day or operational lag/vulnerability of the deck cycles needed to maintain threat rollback in a 24:7 emergent condition. Even high end supersonics via NGAD may not be enough as there is significant evidence that it is when you are able to instant-on pulse the counter engagement (aimpoints per minute in the first few minutes, as the threat is still bunched up on their airheads) which will dictate first hour victory as opposed to second day loss of Taiwan. Once the threat gets stuck in, among the Taiwanese population, It will be impossible to winkle them out and with control over Taipei, Taichung and Kaohsiung, the island can be shut down and compartmentalized within just a few tens of hours. It will literally be a single day evolution, long before we could get there with carrier forces. Compared to Ukraine, Taiwan is tiny and all you have to do is cut a few bridges and tunnels through the mountainous east coast to isolate everything else.
Never mind the enormous hit the West's martial reputation is going to take from the looming abandonment of Ukraine and the crushing debt all Western countries now operate under after three plus decades of treating war as a sport rather than an economic exercise to gain tributary benefits.