YPs

The YP designation stood for Yard Patrol Craft.  Today, such naval ships are used for training and research purposes.  YP is Hull Classification Symbol System.

After Pearl Harbor, the government leased the California tuna boat fleet for the duration of the war.

Sic hundred tuna boat men also volunteered.

The YPs patrolled the coast of the United states, the Panama Canal and the South Pacific.

--GreGen