Squadron may be VP(AM)-3. Two crewmen are relaxing on the 50-caliber in the waist blister, and the flight engineer is looking at the camera through the tower window; the pilot seems to be talking on the mike. Note the JATO equipment behind the aft wing strut.
Mark Aldrich has more info on this plane:
The red bar in the insignia indicates the photo was taken after 1947-Jan. Also, the code "EB" was in use by VP-33 around that time.
(Photo from the R.L.Lawson collection, courtesy of the Nat'l Museum of Naval Aviation)