The General Flipped at Dawn - S3-E1
Visible crew/equipment: After Hawkeye disobeys General Steele's orders, when it cuts to the preliminary hearing in the mess tent, the chalk T-mark can be seen on the floor under the bench at the chopper pilot's feet, where he will stand in a moment.
Visible crew/equipment: As The Bus nears Rainbow Bridge, there is a reflection of either the camera vehicle or equipment in the lower right side of the windshield.
Visible crew/equipment: When Margaret's in her tent reading just as Hawkeye walks in to give her the physical, the chalk T-mark can be seen on the floor.
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.
Visible crew/equipment: When Trapper and Hawkeye are in the Swamp they start arguing, and just as Hawkeye grabs the mandolin the edge of the Swamp set can be seen at the top, left corner of the screen.
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.
Mad Dogs and Servicemen - S3-E13
Visible crew/equipment: As the medics take a stretcher off The Bus, and then Hawkeye goes into The Bus, the shadow of the recording equipment boom plays across them.
Visible crew/equipment: While the Greek shipment of food is being brought into the mess tent, when the cook carrying the lamb walks behind the table, the edge of the tent set can be seen at the top right corner of the screen.
Visible crew/equipment: While Trapper and Hawkeye are already in Henry's office Radar and Henry walk in, and just as Henry says, "Everything in this country disappears except me," the shadow of the boom mic can be seen moving across the wall at the top right side of the screen.
Visible crew/equipment: At the chopper pad, as the scene plays out, reflections of the lighting rigs can be on the chopper canopy.
Aid Station - S3-E19
Visible crew/equipment: As Hawkeye walks into the Aid Station, the shadow of the camera plays across his entrance. Also, the area he walks through is extremely well lit, despite the fact the sun is behind the station, indicating stage lighting.
Visible crew/equipment: As Hawkeye and Trapper sit down to talk with McShane, the shadow of the tip of the boom mic can be seen on the door on the right side of the shot. (00:08:25)
Visible crew/equipment: When Trapper and Hawkeye walk into the Swamp and find Dr. Pak waiting for them, the edge of the tent set can be seen at the top left corner of the screen.
Visible crew/equipment: As Col. Whiteman leave Sentry Post 1, where Klinger is, the boom mic is reflected on his helmet.
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.