Only a fraction of military assignments are combat positions. I knew one Viet Nam vet that spent his entire tour in an air conditioned bunker in Saigon hanging

Only a fraction of military assignments are combat positions. I knew one Viet Nam vet that spent his entire tour in an air conditioned bunker in Saigon hanging tapes on the computer that printed payroll checks. Another, technically in a combat role, spent his tours in the radio room of navy destroyers banging out Morse code. The problems you list are mostly surmountable.