On 13 March, "Benham" embarked upon the last major amphibious operation of the war, the invasion of Okinawa. In company with other destroyers in the screen, she covered the carriers during the American attacks on the Kyūshū airfields and enemy naval installations on the shores of the Inland Sea. The destroyer made her first radar contact with enemy "snoopers" on 17 March and fired on, and drove off, a Mitsubishi A6M Zero fighter that closed her position the following morning. The action continued on 19 March, when "Benham" and made a submarine contact at 02:50. Over the next four hours, both destroyers exhausted their depth charges on the target but did not sink the Japanese submarine. The destroyer then collected survivors from —heavily damaged by a "kamikaze" on 19 March—and delivered them to "Wasp".