Kennedy [ John F. Kennedy - then (1943) a junior officer in the US Navy] ready to disembark after more than a month at sea, was standing at the rail off Tulagi, reflecting on a large billboard that Admiral Halsey had ordered to be erected on the commanding hillside. The message fairly screamed at Kennedy and other newcomers -
"KILL JAPS! KILL JAPS! KILL MORE JAPS!
You will help to kill the yellow bastards
if you do your job well "
[From "PT 109 - The Wartime Adventures of President John F. Kennedy" by Robert J. Donovan]