Winchester: But, know this. You can cut me off from the civilized world. You can incarcerate me with two moronic cellmates. You can torture me with your thrice-daily swill, but can not break the spirit of a Winchester. My voice shall be heard from this wilderness, and I shall be delivered from this fetid and festering sewer.
Potter: I think he's getting the hang of this place.
Dr. Winchester: My family has had problems with immigrants ever since we came to America.
BJ: Radar, old buddy, looking at you is like looking at money in the bank
Radar: All the other tents, they just say 'hello'
BJ: Would you like to join us?
Radar: What are you playing?
Hawkeye: Double Kranko
Radar: Yeah.
Hawkeye: Uh, bishops are worth three jacks...
Radar: Right...
Hawkeye: Checkers are wild...
Radar: Uh-huh
Hawkeye: And...you have to be twenty-one or older to open
BJ: Care to sit in for a hand?
Hawkeye: You'll get out by dawn.
Radar: Ah, no, thank you, sirs. Whenever I lose, I like to know why.
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