Frank: What kind of a jackass do you think I am?
Radar: Oh, you'd know that better than me, sir.
Hawkeye: I will not carry a gun, Frank. When I got into this war, I had a very clear understanding with the Pentagon: no guns.
Frank: Humpf!
Hawkeye: I'll carry your books, I'll carry a torch, I'll carry a tune...I'll carry on, carry over, carry forward, Cary Grant, cash and carry, Carry Me Back to Old Virginny. I'll even Hari Kari if you show me how, but I will not carry a gun!
Henry Blake: Klinger! It's four o'clock in the afternoon and you're still in a housecoat? Put on a dress! You never know who might be coming around.
White Gold - S3-E23
Frank: Well, he, uh, ordered me to leave. He's a superior officer.
Henry: He's a superior psycho. His head's so twisted, he's gotta screw his cap on.
Mad Dogs and Servicemen - S3-E13
Frank: Corporal Travis, Richard. To Tokyo. Typical psycho case, shell shock.
Trapper: Frank, that's straight outta World War One! Nobody thinks shell shock anymore.
Frank: Oh, what's the diff? Too much action gets them in the old brain box; makes even the best soldier gaga.
Trapper: Frank, I defy you to show me a medical book that lists the word 'gaga'.
Frank: [after Hawkeye hits him] Captain Pierce, I accuse you of striking a superior officer. A court-martial offense under the Articles of War. And I have two witnesses!
Trapper: [to Hawkeye] I didn't see anything, did you?
Hawkeye: My back was turned. [Drops towel in Frank's face.] BA-DUM-BUMP!
Trapper: Case dismissed.
Frank: [on Margaret's request] I just can't do it, Margaret. It just rubs against the grain. "Neither a lender nor a borrower be." Polonius.
Margaret: "To give, and not count the cost." St. Ignatius Loyola
Frank: "The holy passion of friendship is of so sweet, and steady, and loyal and enduring a nature, that it will last throughout a whole lifetime if not asked to lend money." Mark Twain.
Margaret: "Blow it out your ear!" Margaret Houlihan.
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