<article><hdr>Ground shot of a Douglas O-2</hdr><body>
<hi style=afpcap>The Douglas O-2 series spanned the period 1923 to 1929 from the prototype XO-2 to the O-2K. Although the basic design was largely unchanged, it was the fitting of various modifications which resulted in the changes. The O-2A was modified for night flying operations, while the O-2B had dual controls for training purposes. Others included the O-2D which was unarmed, and the O-2E featured a new tail. The O-2H was the last of the line, which was an entirely new design with a compact engine installation with a nose radiator similar to that of the O-1C/E, and clean landing gear secured to the fuselage.</hi>
