The General Flipped at Dawn - S3-E1
Visible crew/equipment: After Hawkeye disobeys General Steele's orders, when it cuts to the preliminary hearing in the mess tent, the chalk T-mark can be seen on the floor under the bench at the chopper pilot's feet, where he will stand in a moment.
Answer: Even an Army field hospital would have SOME weapons for self-defense if the enemy attacked. What's meant is that it's not a combat outfit, and therefore wouldn't have enough weapons to actually attack anyone. (It's also mentioned a few times that the Officer of the Watch is supposed to carry a pistol at all times, but Hawkeye refuses to do it when he's in charge and Colonels Blake and Potter don't enforce the rule).
Captain Defenestrator