May 29, 1943 (Saturday)

“Button,” Espiritu Santo

An attempt is being made to hush up the circumstances of Jap Admiral Yamamoto’s death, which some blabber has let out. The fact that we knew the time, the place and the person hours before-hand on that mid-April day, allowing us to send our P-38s and shoot him down, indicates a serious leak in Jap commands — a fact we should have done our utmost to conceal. Actually the “leak” resolves itself into the amazing fact we’ve been able to break down Jap codes since before Midway!