It's possible that a misleading impression could be gained from the above - not that any of it is wrong.
During RTS testing in the UK, the Aircraft Test & Evaluation Centre (ATEC) staff includes military personnel with recent experience in roles other than that of tp, such as rear crew.
It is very common indeed for these military types to fly, with the express purpose of assessing the equipment under test from the perspective of their operational background. It's one of the major reasons for the military element of the ATEC partnership existing, and long may it continue.