Sadly, Her Last Mission
Grayback stayed at Pearl Harbor for over three weeks before going on her tenth mission and sad to say, it was her last. She went out on January 28, 1944, and as noted earlier, her last radio transmission was on February 25, 1944. By March 30, she was declared missing as no contact could be sent, nor was any received. The Grayback had simply disappeared, spawning a widespread search and rescue mission.
Dying with Pride
This final mission saw the Grayback sinking a whopping 21, 594 tons of Japanese shipping. The by now desperate Japanese were heavily relying on such supplies, with the Grayback worsening supply shortages greatly. The ship was now sailing on its third mission with Moore as its director. However, due to the ship not returning, the commander was Posthumously given a third Navy Cross. Grayback was also awarded her eight battle stars for her service during the Second World War.