Engineering Division Aircraft Locator
DesignationNicknamePrimary role
CO-1 U.S. Air Force Corps Observation (1919-1924)
CO-2 U.S. Air Force Corps Observation (1919-1924)
CO-5 U.S. Air Force Corps Observation (1919-1924)
CO-6 U.S. Air Force Corps Observation (1919-1924)