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I agree with Blackstar. From reading the report it looks as if ARPA had sponsored the noise reduction program to improve the tactical capability of US military helicopters in general. Hence, the use of representative helicopters from each branch of service. Once they were tested they found that the OH-6A was significantly quieter over the other candidate helicopters. A Phase II funding effort continued to develop technologies to reduce its noise signature. I think the CIA stepped in later when considering a helicopter to use for the mission, which required visual stealth (flying at night) and aural stealth due to its operations near the enemy. Range and payload capacity would also become an issue as it had to transport a commando, a tap and relay system, additional fuel tankage, and its pilots deep into enemy territory.