Here's one. Four service chiefs are sitting around when the Army Chief of staff says.."Who among us has the bravest soldiers?"
The Commandant of the Marines: I do. See that Marine over there? Marine! Pull the pin out of a grenade and blow yourself up!
Marine: YES SIR!
(Marine pulls pin and blows himself up)
Army Chief of Staff: No way. watch this. Soldier! Run that M-1 tank into that oil storage tank!
Army soldier: Yes Sir!
(Army soldier runs tank into oil tank, tank explodes)
Air Force Chief of Staff: Are you kidding me? Pilot! Get into that F-15, Climb to 20,000 feet, dive and crash!
Pilot: YES SIR!
(Pilot climbs to 20,000 feet, crashes plane)
Admiral: I have you all beat. You see that Sailor on the top mast of USS Nimitz? SAILOR! JUMP OFF THE MAST AND KILL YOURSELF!
Sailor: GO &(^*% YOURSELF SIR!
Admiral: Now that! Is the bravest soldier.