<hi style=afpcap>The Keystone aeroplane company was born from a reorganisation of the Huff-Daland Company. Their biplane bombers were produced in a variety of configurations throughout the 1920s. The LB-6 was based on the LB-5 design, with a number of minor refinements. Both types served with the 2nd Bomb Group during the '20s, which was the sole US based bombing unit at the time.</hi>