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]