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The text on the back of the photo is very interesting in the portion describing the take-off procedure on the short airstrip. It is kind of misleading though, because this is a PBJ-1D and it was not with the 7-th AAF but with one of the Marine Bombing Squadrons on Saipan (just a guess here: VMB 612). Characteristic are the "hose nose" - scanner housing of APS-3 radar, deleted upper turret (less weight) and modified side (waist) windows. There is a single tail gun (mod) as well. Note the HVARs. Towards the end of the war some of these a/cs have been repainted in overall dark sea blue as seen above.
I tend to disagree with the description of a "Pathfinder-mission" on the back of the photo. Pathfinders in bombing formations were H2X-radar equipped bombers, used during BTO-missions. In fact the PBJs of the Marines were often used for sole missions over the ocean, searching (and destroying) enemy vessels (as mentioned in the description too). That's the reason not to carry upper defensive armament (no enemy fighters in the air) and save weight for a long and lonely flight - thus the long range tank in the bomb bay.