The LATMDS contract was issued under the rapid prototyping pathway that Congress had authorized to speed up procurement with less controls to meet the very situation you mention, but Congress imposed a five year time limit. Raytheon failed to meet the terms of the contract to develop the radar in the five year time limit and it took them six years and 34% overspend. Certain members of the Senate were understandably upset as the Army knowing of the delay and the law never moved the contract to the standard major capability acquisition pathway which at $13 billion plus R&D $billions? it qualifies as. (Its an unknown if the other competitors for the contract Lockheed and Northrop Grumman would have succeeded, but as said Raytheon failed)