Continuity mistake: The mud spots on Lt.Smith's face change from scene to scene. (00:09:45)
Visible crew/equipment: After Henry meets with Colonel Blanche, the Luxembourg Commander, it cuts to Hawkeye in the Swamp continuing his recording to his father, and when Trapper describes his recipe for the dry martini we can see the open edge of the tent set and a spotlight at the top left corner of the screen.
Continuity mistake: As Lt. LeClerq stands beside his commander, the Commander starts to look to his left, and drops his hand. When the angle changes, he drops his hand again.
Continuity mistake: The syringe the "Mad Turk" threatens Henry with alternates between fully ready to almost empty between shots.
Continuity mistake: As he addresses Maj. "Chicken Lover", Lt. Smith's head goes from leaning left to leaning right between shots.
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.