This is a picture of a biplane squadron attached to the U.S.S. Lexington in August 1939 from U.S. Naval institute

 begin quote from U.S. Naval institute

Curtiss SBC-4 Helldivers of Scouting Squadron 2, assigned to the USS Lexington (CV-2), are lined up and ready for action in August 1939. Vought SB2U-1 Vindicators of Bombing Squadron 2 can be seen in the background.