The intensive international co-operation in developing the F-35 (particularly between the USMC and RAF/FAA on the B-model) inevitably called for consensus between the type's British and US operators in vital areas of the terminology they use.
Such common parlance (especially for SOPs) would have been essential during the testing and conversion training programmes at Beaufort - and it's quite likely that, in turn, the USMC's 'stand up/stood up/was stood up' etc terms then slipped into use among the new British F-35B pilots and their senior officers.
However (ref the OP's query), whether "former F-35B pilots in the RAF" would reminisce about themselves as 'stood up/down' in their flying careers is debatable, and could be influenced by their previous squadrons and types.
A pal of mine with experience editing stories for aviation periodicals tells me that MoD and RAF press releases have become increasingly mired in such contemporary US parlance. Standardisation (particularly with F-35B) may make this inevitable, but it flies in the face of heritage - an essential part of RAF and FAA esprit de corps.
It remains to be seen how the yet-to-be-formed RAF/FAA squadrons (for the PoW carrier) adopt or eschew American parlance other than what's essential for operational or safety reasons.
Any Fleet Air Arm folks care to comment?
Last edited by XV490; 16th Feb 2020 at 07:19.