Sam, Medal of Honor winner
Never caught this before but watching tonight it hit me. Unstated but subtly conveyed.
In the scene where the detectives roust Sam in his hotel bed, one officer inspects Sam's wallet and notes "North Africa, Anzio, Normandy", and asks why he doesn't wear "it". "The same reason you don't wear your badge, I like to be incognito". So soon after the war, lesser awards wouldn't be so rare or remarkable as to warrant such comments. In the scene's context what else could this refer but the Medal of Honor lapel pin that accompanies the award.