In a slight derailment, it would take a lot of guts to be a medic.

You would have to serve without a weapon, armed only with the knowledge that people aren't "supposed" to shoot you. You would have to be the one running around in an artillery attack, while your buddies take cover in foxholes. You would quite literally see the face of war, see buddies die horrible deaths three feet away from you, see friends and foe alike wounded close-up...and I haven't even started about the Pacific Front.

If I had to choose a normal combat job, it would be that of a medic. Taking lives is something that I could not do well, even if the alternative was just, if not more, dangerous.