Visible crew/equipment: While BJ's holding Peg's letter and telling Hawkeye about being homesick and depressed, the edge of the Swamp set can be seen at the top, left corner of the screen.
Visible crew/equipment: After Radar shows the box of bees to BJ and Hawkeye, when BJ gets in the jeep and drives off, just before the shot cuts away we can see the T-mark on the ground at Radar's feet.
Visible crew/equipment: After a 14 hour shift in the OR, when sleepy BJ and Hawkeye are in the change room just as Hawkeye says, "Let's face it, their demand is bigger than your supply," the shadow of the moving boom mic is visible on the curtain.
Visible crew/equipment: When Klinger's in Colonel Potter's office wearing the fur coat and rubber reducing suit, just as Potter says, "This one is definitely in the running," we can see the shadow of the boom mic shaking up and down on the wall, at the left side of the screen.
Peace on Us - S7-E2
Visible crew/equipment: When Radar gets off the phone with the guard at Panmunjom and tells Colonel Potter and BJ that Hawkeye's gone on ahead, at the start of the next shot we can see the back of the soundstage set at the top, right side of the screen. And notice that Hawkeye's and the guards' voices are echoey on the soundstage in this shot.
Visible crew/equipment: After Margaret tells Hawkeye that he ran the siege pretty well then salutes him, when it cuts to BJ returning to camp with the wounded GI, the boom mic dips into view at the top of the screen.
Visible crew/equipment: As the M.P. jeep escorting the General's jeep gets close to the camera, a reflection of a lighting rig or reflector is seen in the right windscreen.
Visible crew/equipment: As Klinger sits in the chair dressed in a winter coat, you can see the boom mic and light panel reflected in his shades.
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