Audio problem: As Trapper opens the door to the swamp and the football flies in, a splash is heard as if it hit a tub of water, followed by the sound of a high, fluted vessel filling with water. Neither of those sounds make sense in this case. (00:07:00)
Visible crew/equipment: After the scene in the x-ray room with Henry asking Hawkeye and Trapper to "read between the lines" in the letter from Henry's wife, when it cuts to Radar on the phone the shadow of the boom mic can be seen on the wall at the top left side of the screen, right before it's pulled up.
Factual error: Radar finds a rabbi on board USS Essex, but the film shown of the Essex isn't...it's the USS Yorktown CV-10.
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.