The Canadian DHC 4 Caribou was used by the US Army and transferred to the USAF in 1967. The Army also trialled the bigger, turboprop DHC 5 Buffalo, but this wasn't picked up by the USAF because of their C123 fleet. These STOL aircraft would have been awesome if they were still around for Afghanistan.
The US Army got pretty good usage out of the Caribou's, correct?
In Vietnam they did, they're a great plane which can access areas not much bigger than a helicopter needs but with a higher transit speed and vastly lower purchase and operating cost.
But what we're talking about here is the USAF building and using aircraft from abroad like they used the F-16 or Delta series right?
The Blackburn/HS Buccaneer was a two seat strike aircraft, nuclear capable. Its nearest US equivalent was the A6 Intruder. The Buccaneer was also good as a buddy-buddy tanker and could be configured as a tanker rather than strike aircraft. One or maybe two per squadron had that role on the UK carriers.OK, it would have been used in place of what OTL aircraft?
The RR Spey was built under licence by Alison as the TF41 and fitted to the A7D & E. Perhaps it could have been fitted to the F14 as well, solving the problems that the TF30 caused with that otherwise awesome plane.
British missiles, engines, and technology patents could be usable. They had very competitive missiles (Red Top had or was planned for all-aspect targeting well before the AIM-9 Sidewinder) and engines (turboprop and turbojet/turbofan, including the Rolls-Royce Spey and Rolls-Royce/Snecma Olympus 593), and useful developments in a variety of other fields such as thrust vectoring rocket engines (Rolls-Royce RZ2 on the Blue Streak), blown flaps, the rotodyne, the Hawker Siddeley Kestrel and ski jumps (as well as rubber decks).
Here's what I think is a possibility: the BAC TSR.2.
It may sound crazy, but General Dynamics ran into a LOT of serious developmental problems with the engine intakes, avionics and the swing-wing wing box of the F-111, problems that weren't fully resolved until later production F-111 models arrived around 1971. As such, the TSR.2 could have been modified for USAF use by 1970 with a smaller-fan GE F101 derivative (essentially the GE F110 in an earlier development timeframe), American avionics and the ability to carry the B28, B43, B61 and eventually B83 nuclear bombs (along with a long list of conventional weapons).
There was some consideration given to adopting the Panavia Tornado in the all weather attack / strike role as an alternative to the F-15E. A non-starter to be fair.
The Tornado was considered a second time for the Wild Weasel SEAD role then undertaken by the F-4G. The F-15 (F-15G?) was also strongly looked at. Of course, the F-16 now fills this niche.