Good-Bye Radar: Part 1 - S8-E4
Visible crew/equipment: When Radar arrives back at camp the Korean driver fixes Radar's stiff neck, and just as Radar gives him the money and we hear people cheer that Radar's back, the shadow of the boom mic can be seen on the ground at the bottom left side of the screen.
Good-Bye Radar: Part 1 - S8-E4
Visible crew/equipment: When Radar gets back to the 4077 and goes to the office with Klinger, just as he walks into the doorway the shadow of the moving boom mic can be seen on the wall at the right side of the screen.
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