Royal Flying Corps On Active Service cover from Flight Lt. John Playford Hales serving with 9 Naval Squadron R.N.A.S. Cover has a CEN 9 SQ SOR hand stamp on the front in red. The naval squadrons were assigned Dover Patrol censors as they were under the command of Rear Admiral Dover. John Hales, now a Captain was killed in action Aug. 23rd. 1918 while serving with 203 Squadron R.A.F. Includes an interesting letter. To Winnipeg, Manitoba.