Visible crew/equipment: When Margaret listens in on Frank's phone conversation with his wife, Margaret throws a chair at him and storms out of the office, and after she calls Frank a chinless chipmunk a boom mic dips into view at the top, left corner of the screen.
Dear Sigmund - S5-E7
Visible crew/equipment: As Potter pans around looking with binoculars, the lighting rig and a crew member can be seen reflected in the lenses.
Visible crew/equipment: As Potter turns away from looking at Burns rousting a man, he walks past the camera talking to himself. As he gets close to the camera, the shadow of the boom mic plays on his left sleeve.
Visible crew/equipment: As Hawkeye and Trapper sit down to talk with McShane, the shadow of the tip of the boom mic can be seen on the door on the right side of the shot. (00:08:25)
Visible crew/equipment: At the chopper pad, as the scene plays out, reflections of the lighting rigs can be on the chopper canopy.
Mad Dogs and Servicemen - S3-E13
Visible crew/equipment: As the medics take a stretcher off The Bus, and then Hawkeye goes into The Bus, the shadow of the recording equipment boom plays across them.
Visible crew/equipment: As Hawkeye, BJ, and "Ralph" come over to help the farmer, the shadow of the boom mic is on the ground at the bottom right side of the shot.
Visible crew/equipment: As Hawkeye walks over to the Colonel, there appears to be a lighting rig, or a reflector, over the Colonel's cot in the upper left of the shot. (00:20:35)
Visible crew/equipment: As Potter and Hawkeye look at the totalled and burning jeep, the shadow of the camera's shade can be seen at the lower left corner of the shot.
Visible crew/equipment: When the camera angle changes to look at the cover being put over the soldier's head, the camera is briefly reflected until the cover is locked in place.
Visible crew/equipment: As The Bus nears Rainbow Bridge, there is a reflection of either the camera vehicle or equipment in the lower right side of the windshield.
Deal Me Out - S2-E13
Visible crew/equipment: After the C.I.D. man comes into the swamp and makes reference to Klinger, who looks up, you can see a studio light panel reflected in his shades.
Visible crew/equipment: In the swamp, behind the General, you see a hole in the tent that disappears a second later. In that second, you see a boom mic.
Visible crew/equipment: When Trapper and Hawkeye are in the Swamp they start arguing, and just as Hawkeye grabs the mandolin the edge of the Swamp set can be seen at the top, left corner of the screen.
Visible crew/equipment: As Kelley gets up to allow Sidney to sit, the tip of the boom mic bobs in the top of the frame.
Visible crew/equipment: As Margaret gets into the chopper, the lighting rigs, camera and crew are reflected in the canopy.
Henry, Please Come Home - S1-E9
Visible crew/equipment: After Reveille has blown, Radar comes in, and gets items thrown at him. As the door closes, there's a reflection of the studio lighting on the glass.
The General's Practitioner - S5-E20
Visible crew/equipment: When the Colonel that Hawkeye referred to as "Bozo" is talking to General Korso on the way to the 4077th to get Hawkeye, you can see the shadow of the camera on the Colonel's lap.
Visible crew/equipment: As BJ comes around to take the wounded soldier to Post-Op, he walks in front of the camera. As he does so, the shadow of the camera can be seen on his back.
Answer: It is actually Cencompac for Central Command of the Pacific. It is like the headquarters for all military activity in the Pacific Region (Japan, Korea, Okinawa, etc. The newer version of that is United States Pacific Command (USPACOM).
EMTurbo
And the abbreviations were used mainly by the Navy. Especially CENCOMPAC.
Https://en.wikipedia.org/wiki/United_States_Indo-Pacific_Command.