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On 18 December 1972, tail gunner SSgt Samuel O. Turner's B-52 had just completed a bomb run for Operation Linebacker II and was turning away when a North Vietnamese Air Force MiG-21 approached. The MiG and the B-52 locked onto one another. When the fighter drew within range, Turner fired his quad (four guns on one mounting) .50 caliber machine guns. The MiG exploded aft of the bomber, a victory confirmed by MSG Lewis E. Le Blance, the tail gunner in a nearby Stratofortress. Turner received a Silver Star for his actions. His B-52, tail number 55-0676, is preserved on display with air-to-air kill markings at Fairchild AFB in Spokane, Washington.
On 24 December 1972, during the same bombing campaign, the B-52 Diamond Lil was headed to bomb the Thái Nguyên railroad yards when tail gunner A1C Albert E. Moore spotted a fast-approaching MiG-21. Moore opened fire with his quad fifties at 4,000 yards (3,700 m), and kept shooting until the fighter disappeared from his scope. TSG Clarence W. Chute, a tail gunner aboard another Stratofortress, watched the MiG catch fire and fall away.