Visible crew/equipment: When they're all in the OR talking about Aggie being at the 4077, Charles compares Colonel Potter's art style to Aggie's, and in the next shot as Potter tells the art critic to tread softly, the boom mic is visible at the top, right side of the screen and just as the mic starts to pull up the shot zooms in on Aggie.
Visible crew/equipment: While Klinger's practicing Colonel Potter's forged signature on the notepad, when BJ walks in on him and then picks up Klinger's notepad the boom mic moves across the top of the screen.
Good-Bye Radar: Part 2 - S8-E5
Visible crew/equipment: After Radar tells Colonel Potter that he decided to go home after all it cuts to Hawkeye walking into the office, and just as Hawkeye opens the door we can see the top of the set.
Are You Now, Margaret? - S8-E2
Visible crew/equipment: When Williamson and Hawkeye walk into the Swamp and stand near BJ's cot, the edge of the tent set can be seen at the top, left side of the screen.
Visible crew/equipment: After Klinger gives the envelope with the forged discharge papers to the driver going to I Corps, just as he walks through the doorway we can see the two actors' tape marks on the ground, where the driver and Sidney were standing when they arrived.
Visible crew/equipment: After the opening credits, in the very first shot in the OR we can see the boom mic dipping into view at the top, left side of the screen.
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.
Visible crew/equipment: When BJ's in Margaret's tent talking to Aggie about feeling like a prisoner of war, just as he says, "I work because of the war," the boom mic dips into view at the top of the screen.
Visible crew/equipment: When Sidney arrives and speaks with Klinger in the office the door remains open for the next few shots, and while Klinger first talks to the doctor and then to the driver, we can see the top of the crooked "sky" backdrop behind the tent in the compound.
Visible crew/equipment: While BJ and Hawkeye are in the Swamp playing darts, after BJ barely misses Charles with his throw, just as Charles storms into the Swamp the boom mic dips into view at the top of the screen, over Charles.
April Fools - S8-E25
Visible crew/equipment: At the Officers' Club, after Potter and Tucker's practical joke is out of the bag and they're congratulated, when it cuts to everyone sitting at the bar, at the start of this shot the boom mic is visible at the top, left side of the screen just before it's pulled up.
April Fools - S8-E25
Visible crew/equipment: After the scene with Klinger, who's dressed as Cleopatra, lying down on his cot in the office, when it cuts to the shot of the Swamp as it pans out, we can see the corner of the Swamp set at the top, left side of the screen.
April Fools - S8-E25
Visible crew/equipment: When Klinger wakes everyone up in the Swamp, just as Hawkeye asks Klinger if he saw anyone else lurking around the Swamp, the shadow of the boom mic can be seen moving at the top, left side of the screen.
April Fools - S8-E25
Visible crew/equipment: After the opening credits, in the closeup of Charles and Colonel Potter just as Charles complains about what's undoubtedly awaiting them in the mess tent, there's a shadow of a moving boom mic at the top, left corner of the curtain.
Visible crew/equipment: As the camera pans around the bed in Margaret's dream, you can see the camera man and equipment reflected. Also, when the soldiers march past, the shadow of the microphone rig plays across each one as they pass the bed.
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.
Are You Now, Margaret? - S8-E2
Visible crew/equipment: When Williamson, the Congressional Aide, is in Colonel Potter's office questioning Margaret about Wally, right after Hawkeye makes the comment about liberty and justice for all, in the next wideshot as Williamson walks to the other side of the room the T-marks and chalk marks can be seen on the floor.
Visible crew/equipment: When General Haggerty walks into the mess tent and stands beside Colonel Potter, the chalk T-mark can be seen on the floor near his feet, and when Haggerty wants to meet the cook the chalk mark can be seen on the floor where Conway stands.
Visible crew/equipment: After BJ and Hawkeye have tasted the Spam Parmesan, when Klinger calls the cook over, in the shot of Conway the edge of the tent set can be seen at the top right corner of the screen.
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.
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.