If these are following then it could be a standard training. The block for that training typically FL12.0 to 25.0 got the tee shirt
pb>>10728964
retired USAF and this airframes are limited in the original 135 fleet. Boeing retro fitted 11 KC-135E's with receiver capability as a part of cold-war operations. Later the R model contract included these in the re-engine conversion. Having turned wrenches on every model, these had some interest quirks compared to others. I was mech and later and FE
https://www.youtube.com/watch?v=TcJ-wNmazHQ here you got Q
genocide