Engineering Division
Aircraft Locator
Designation
Nickname
Primary 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)
