Front cover of a US Navy training manual for PT Boat crew, issued early in 1945.  It repeats the "sea mosquito" theme.  Best regards, JR.

PT Boat training manual, front cover.

Soviet training poster giving helpful suggestions for anybody wishing to destroy a German PzKpfw III.  Best regards, JR.

Helpful Hints.

Back cover of 1945 PT Boat training manual showing - presumably - the confusion into which PT Boat crew might fall if they do not read the manual ... Best regards, JR.