Japanese Territory
It was the perfect time to test the submarine’s programs and the crew was able to get acquainted with the systems. The submarine was successful with the test and went to patrol Chesapeake Bay Caribbean in September 1941.
Her First Success Mission
After work was done at Portsmouth Naval Shipyard on the Maine Coast, Grayback went for Pearl Harbor in February 1942, since the US was now actively engaged in WWII. February 15 was when the submarine was off into the Pacific and along the coasts of the Island of Guam.