Continuity mistake: Near the end, Margaret and her husband are shown leaving for their honeymoon in a jeep. You can see Trapper and Hawkeye in the background with a wheelchair. Then it cuts to an emergency room surgery session that appears to be a throw-in scene showing them worn out. Then, after the commercial, it shows Margaret leaving again and Trapper and Hawkeye with the wheelchair in a full scene.
Continuity mistake: As Ames is pitched the idea of diet and exercise, he has his fork up with a bite of egg on it. When Hawkeye reaches for the fork, it's upside down and clean.
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