60th Bombardment Squadron (Heavy) on 30 April 1990. In August 1990, Andersen personnel began shipping over 37,000 tons of munitions to forces in the Persian Gulf in support of Operations Desert Shield and Desert Storm. With the eruption of Mount Pinatubo in June 1991, Andersen was instrumental in caring for American evacuees and their pets as a part of Operation Fiery Vigil. In December, Andersen became home to the Thirteenth Air Force, which had evacuated from Clark Air Base in the Philippines after the eruption. Post Cold War The host unit was changed on 1 October 1994, when the 633rd Air Base Wing was inactivated. The 36th Air Base Wing took over host operations and was redesignated as the 36th Wing on 12 April 2006. In October 1994, the U.S. Navy's Helicopter Combat Support Squadron Five (HC-5) relocated to Andersen from the now-closed Naval Air Station Agana, Guam. HC-5 was later redesignated as Helicopter Sea Combat Squadron Twenty-Five (HSC-25) following its transition from the CH-46 to the MH-60S. The base was one of the few places in the world where the NASA Space Shuttle was permitted to land, serving as an Augmented Emergency Landing Site for the Shuttle orbiter. In 2007, the 50-year-old South Runway's condition had deteriorated to a point at which complete removal and replacement of the runway was necessary to maintain safety. The 50.6 million-dollar runway replacement was a Design-Build project from the Air Force Civil Engineer Support Agency to the Tutor-Perini Corporation and its local subsidiary, Black Construction Company. The project's scope included demolition and reconstruction of the existing 11,185 feet by 200 feet South Runway, repairs and tie-ins to existing taxiway intersections, removal and replacement of degraded airfield lighting, and arresting gear realignment and reconstruction. On 23 February 2008, a USAF B-2 Spirit stealth bomber, one of the most expensive military aircraft in the world, crashed on the base. Both pilots ejected safely before the plane, valued at U.S. dollars, crashed moments after take-off due to a mechanical failure. This was the first time a B-2 had crashed. On 21 July 2008, a B-52 crashed into the sea while on a training mission that was to fly over a parade in Guam commemorating the U.S. liberation of the island from Japanese occupation in 1944. B-2s and B-52 aircraft from the 13th Bomb Squadron and 393d Bomb Squadron have taken turns in order to provide a