The USS Markab (AD-21) was a Hamul-class destroyer tender that played a significant role in U.S. Navy operations during World War II and the Cold War. Originally built as the cargo ship Mormacpenn by Ingalls Shipbuilding Company in Pascagoula, Mississippi, she was launched on December 21, 1940. Before entering commercial service, the Navy acquired her on June 2, 1941, and she was commissioned as USS Markab (AK 31) on June 15, 1941. Initially operating in the Atlantic, Markab supported amphibious forces around Hampton Roads and supplied American troops in Greenland and the Caribbean. In January 1942, she was converted to a destroyer tender, redesignated AD-21, to better serve her new role. After shakedown, she transited the Panama Canal to join the Pacific Fleet at Pearl Harbor, where she supported ships involved in the Solomon Islands campaign. Throughout 1943 and 1944, Markab provided crucial repair and logistical services at key locations such as Pearl Harbor, Majuro, Eniwetok, and Ulithi, playing a vital part in preparing destroyers for major Pacific battles, including the invasions of Attu, Kiska, Saipan, and Iwo Jima. Her efforts extended to the final stages of the Pacific War, assisting in operations around Okinawa and preparing ships for raids on Japan. Following Japan's surrender, Markab supported occupation efforts in Japan, Korea, and China, arriving at Sasebo and Shanghai before returning to the United States in 1946. She was decommissioned in January 1947 and entered the Atlantic Reserve Fleet. Reactivated during the Korean War, she was recommissioned in 1952 and operated along the U.S. East Coast until her decommissioning in July 1955. Reconverted as a repair ship (AR-23) in 1960, Markab was homeported at Alameda and deployed to the Western Pacific, supporting ships during Vietnam War operations and returning Chinese art treasures to Taiwan. She earned one campaign star for Vietnam service. She was finally decommissioned in December 1969, struck from the Naval Vessel Register in 1976, and sold for scrapping in 1977. The USS Markab's service record reflects her importance as a versatile logistical and repair vessel across multiple major conflicts.

This description has been generated using GPT-4.1-NANO based on the Vessel's wikidata information and then modified by ShipIndex.org staff.