I note also the CIA denied any release of a report on the low-level air recon missions over the PRC. In the 1960s, these missions were carried out by RoC RF-101s but when they started, during the Korean War, they were first carried out by RAF Spitfire FR 18s from Hong Kong, supplementing high-altitude Spitfire PR19s (I mentioned these in my book THE DECISIVE DUEL, SPITFIRE VS 109).