The world first saw the power of space to transform warfare in the 1991 Gulf War. In the years since, the U.S. military has come to depend heavily on space throughout its peacetime and combat operations. Satellites acquired by the Department of Defense (DOD) principally provide protected communications; data for position and timing, terrestrial and space weather, missile launch warning and tracking, and space situational awareness; and experiments and other research and development activities. Satellites for reconnaissance and surveillance are the domain of the National Reconnaissance Office (NRO), under the Director of National Intelligence (DNI).