of their GDP to counter SDI, or else watch as their expensive nuclear stockpiles were rendered obsolete. United States Space Command (USSPACECOM), a unified command of the United States military, was created in 1985 to help institutionalise the use of outer space by the United States Armed Forces. The Commander in Chief of U.S. Space Command (CINCUSSPACECOM), with headquarters at Peterson Air Force Base, Colorado was also the Commander in Chief of the bi-national U.S.-Canadian North American Aerospace Defense Command (CINCNORAD), and for the majority of time during USSPACECOM's existence also the Commander of the U.S. Air Force major command Air Force Space Command. Military space operations coordinated by USSPACECOM proved to be very valuable for the U.S.-led coalition in the 1991 Persian Gulf War. The U.S. military has relied on communications, intelligence, navigation, missile warning and weather satellite systems in areas of conflict since the early 1990s, including the Balkans, Southwest Asia and Afghanistan. Space systems are considered indispensable providers of tactical information to U.S. war-fighters. As part of the ongoing initiative to transform the U.S. military, on 26 June 2002, Secretary of Defense Donald Rumsfeld announced that U.S. Space Command would merge with USSTRATCOM. The UCP directed that Unified Combatant Commands be capped at ten, and with the formation of the new United States Northern Command, one would have to be deactivated in order to maintain that level. Thus the USSPACECOM merger into USSTRATCOM. On December 10, 2019, the United States Space Force was formed as the world's only independent space force. Operation Hardtack 1 Operation Hardtack 1 was a series of nuclear tests carried out by the United States Government in 1958. A major facet of these tests was three high-altitude nuclear tests: YUCCA, ORANGE, and TEAK. YUCCA was detonated April 28 at an altitude of 86,000 feet and had a comparatively small yield of 1.7 kilotons. YUCCA is notable as the first nuclear test carried via balloon. Following tests ORANGE and TEAK were carried out July 31 and August 11 at altitudes of 252,000 feet and 141,000 feet, respectively. The bombs were delivered via rocket and their yields were in the megaton range. Starfish Prime Starfish Prime was a nuclear test carried out in 1962 over Johnston Atoll by the United States as part of Operation Fishbowl. The 1.4 megaton bomb was detonated at an altitude of 400 km (250 miles), in the ionosphere and was