Hi Skylark1

See http://history.nhq.cap.gov/historica...atrol_airc.htm regarding General Memorandum-29, May 25 1942. "...now required the removal of the red three bladed propellor from the CAP aircraft emblem on all airfraft assigned [to Costal Patrol]. The official CP insignia now consisted of a blue circle with white isosceles triangle was the only authorized insignia for CAP-CP aircraft. This was in keeping with the current practice of the AAF to avoid confusion with Japanese emblem. This directive and practice remained in effect until the Costal Patrol units were disbanded in 1945."

Red 1
[formerly LtC, Historian, Maryland Wing, Civil Air Patrol]