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.
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.
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.
Visible crew/equipment: As Kelley gets up to allow Sidney to sit, the tip of the boom mike bobs in the top of the frame.
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.