Mezue ahịrịokwu na-esonụ: Huckins meriri nkwekọrịta ya na 1941, mgbe ndị agha ụgbọ mmiri dị njikere iwepụ ihe omume PT, ma nye ikikere iji Quadraconic hull na PT ụgbọ mmiri. Ha nyekwara ikike maka Elco, Higgins na Philadelphia Navy Yard iji mee ihe ha patented laminated keel, nke na-abawanye ike hull. E nyere ngụkọta nke ụgbọ mmiri 18 dị mita 24 maka ndị agha mmiri nke 14 na nke 26 ná mmalite 1943. E kenyere ha ọrụ n'ebe ụfọdụ n'obodo ahụ.
Ọwa mmiri Panama, Miami, Florida, Mpaghara Oké Osimiri Hawaii na Pearl Harbor, na Central Pacific, na ebe ọzụzụ na Melville, Rhode Island.