This was a radar search for enemy shipping mission involving 5 planes from the 6th Bomb Group:
Following the Truk mission the Sixth flew a series of three radar search
missions on the 11th, 12th and 14th of February in cooperation with the Navy
to determine the amount and type of Jap shipping between Tinian and the
Empire. This was in preparation for the Navy's carrier-based strikes.
Observations were made visually and by radar.
Lt Bernard A. Casaurang and crew of the 39th Squadron crashed into the ocean about forty-five minutes after takeoff on
the 12 February mission. Crew members of other ships in the formation observed the plane lose No. 4 engine and fire break out
on the starboard side. They also saw the ship explode as it struck the water. Dumbo
search planes found only small bits of wreckage near the scene. This
was the Sixth's first combat loss.
[Pirate's Log, p. 29]