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In the end, after a bureaucratic war too complex to summarize here, OSS and SACO tacitly agreed to go their separate ways — and Donovan had to do his work without any cooperation from the Chinese.

Miles retired as a vice admiral. On his 60th birthday, Chiang sent him a scroll reading, “Two men in the same boat help each other.”

Joseph C. Goulden’s most recent book is “The Dictionary of Espionage” (Dover, 2012).