Coast Guard aviators flew the R-6 during World War I, during flight training and operationally in the European Theatre.
No caption/date/photo number; photographer unknown.
Aircraft History File, U.S. Coast Guard Historian’s Office.
Gordon Swanborough & Peter M. Bowers. United States Navy Aircraft Since 1911. (Annapolis: Naval Institute Press, 1990-third edition), pp. 164-165.
Arthur Pearcy, U.S. Coast Guard Aircraft Since 1916 (Annapolis: Naval Institute Press, 1991), pp. 158-159.