MightSat-1 was a small spacecraft developed by the U.S. Air Force's

United States Air Force

The United States Air Force is the aerial warfare service branch of the United States Armed Forces and one of the American uniformed services. Initially part of the United States Army, the USAF was formed as a separate branch of the military on September 18, 1947 under the National Security Act of...

 Phillips Laboratory (now part of the Air Force Research Laboratory Space Vehicles Directorate) to test technology for small satellites.The 140-pound satellite was launched from the Space Shuttle Endeavor in December 1998 and performed robustly in orbit, with no spacecraft anomalies during its mission. MightySat I's mission ended when it re-entered the atmosphere at 1711 Zulu on 21 November 99.