Office of the Chief of Naval Operations, to Vice Admiral William S. Sims, Commander, United States Naval Forces Operating in European Waters
Op-19-D OL 2486
January 26, 1918.
VICE ADMIRAL SIMS
(BOX)Following method of marking aircraft approved by
Secretary of War and Secretary of Navy Quote Wings-Red Circle with diameter approximately equal to chord comma inner blue circles with diameter two-thirds of chord comma center white circle with diameter one-third the chord period Rudder-Vertical red comma white and blue stripes starting at the rudder post unquote 01027
Source Note: Cy, DNA. RG 45, Entry 517B.