Goodbye, Farewell, and Amen - S11-E16
Visible crew/equipment: While Klinger is on the phone trying to set up BJ's transportation home, just as Winchester walks into the office pointing out the company clerk the shadow of the moving boom can be seen on the wall, and it's also visible when Winchester takes the mailbag and dumps the contents. (00:42:50)
Visible crew/equipment: While Kilnger's guarding Soon-Lee, when Father Mulcahy walks into the tent the shadow of the boom mic dips into view at the top, left side of the screen.
Visible crew/equipment: In the Swamp, when Houlihan shouts, "I'll be back and you better come up with something," the moving shadow of the boom mic can be seen at the top, left side of the screen.
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.