In October 1940 Capt. A.W. Clarke, R,N,, the British Government's personal liaison with President Franklin Roosevelt, received an invitation ro visit the Navy Department's War Plans Division. Once there, Clarke's host, Capt. Richmond "Kelley" Turner, ushered him into a room, unlocked a safe, and presented him with a document that proved to be the U.S. Navy's operational plans for war with Japan Left alone and encouraged to read, the British captain was astonished at the amount of detail the plans contained.
Doyle, Michael K.
"The U.S. Navy and War Plan Orange, 1933-1940: Making Necessity a Virtue,"
Naval War College Review: Vol. 33
, Article 4.
Available at: https://digital-commons.usnwc.edu/nwc-review/vol33/iss3/4