The 498th Nuclear Systems Wing was a wing of the United States Air Force based at Kirtland Air Force Base, New Mexico. World War II The wing was initially established as the 498th Bombardment Group, Very Heavy on 19 November 1943. The group remained unmanned until it was activated on 20 November 1943. The group was established at Clovis Army Air Field, New Mexico, and assigned to Second Air Force. It was to be a B-29 Superfortress group. The unit was formed with four bomb squadrons (873d, 874th, 875th and 876th), all being newly constituted. It moved to Great Bend Army Air Field, Kansas in December 1943 to begin training. Due to a shortage of B-29s, the group was equipped with former II Bomber Command B-17 Flying Fortresses already at Great Bend which were previously used for training heavy bomber replacement personnel. In the spring of 1944, it finally received newly manufactured B-29 Superfortresses. In May shortages in aircraft and equipment led to the 876th Bomb Squadron being inactivated (10 May 1944), with its personnel being consolidated into other group squadrons (the 880th would be reactivated in August as part of the 383d Bombardment Group). The 498th Bombardment Group operated very heavy (B-29 Superfortress) bombardment aircraft against Japan as part of Twentieth Air Force. Its aircraft were identified by a "T" and a square painted on the tail. As a three squadron group, the 498th Group moved to the Mariana Islands in the North Pacific in September 1944, being assigned to the 73d Bombardment Wing, XXI Bomber Command, at Isely Field, Saipan. Upon arrival the group's personnel were engaged in Quonset hut construction. By mid-October most personnel were able to move into the huts from the initial tents in which they were accommodated on arrival. The group began operations with its first combat missions against Iwo Jima and the Truk Islands. Took part in the first attack (24 November 1944) on Japan by AAF planes based in the Marianas. Conducted numerous attacks against industrial targets in Japan, flying in daylight and at high altitude to carry out these missions. The group received a Distinguished Unit Citation for striking an aircraft engine plant at Nagoya on 13 December 1944. Began flying missions at night in March 1945, operating from low altitude to drop incendiaries on area targets in Japan. The 498th BG received second DUC for incendiary raids. on urban industries