I think you would need to modify the Key West and Johnson-McConnell agreements to allow for Army control of some tactical fixed wing aircraft. I can't think of a practical POD, short of the USAF dropping any CAS efforts after Vietnam. No A-10, etc
Not sure how practical it is, but the RAF or British Army buy a few OV-10 for recce work over Northern Ireland (faster than a helicopter, more suited to the role than the Islanders). During a joint peacekeeping op (Beiruit?) a British officer mentions how well they performed to a USMC or US Army officer. The USMC/Army realise the potential usefulness and lobby for a couple of squadrons worth. They look to be on their way to the scrapheap by the early 90s when US involvement in Bosnia again shows the requirement for a (relatively) cheap to run recce asset in non-war operations.