United Space Alliance (USA) was a spaceflight operations company. USA was a joint venture which was established in August 1995 as a Limited Liability Company (LLC), equally owned by Rockwell International and Lockheed Martin. The sale of Rockwell's aerospace and defense assets, including the Rockwell Space Operations Company (RSOC) and the Space Transportation System Operations Contract (STSOC) to Boeing in December 1996 made Boeing the co-owner along with Lockheed for the rest of the company's corporate existence. The company was headquartered in Houston, Texas and in 2008 employed approximately 8,800 people in Texas, Florida, Alabama, and the Washington, D.C. area. In 2014, the company was in the process of dissolving. The company was finally dissolved on 20 December 2019.

The Lockheed Martin Corporation is an American aerospace and defense manufacturer with worldwide interests. It was formed by the merger of Lockheed Corporation with Martin Marietta in March 1995. It is headquartered in North Bethesda, Maryland, in the Washington, D.C. area. As of January 2022, Lockheed Martin employs approximately 115,000 employees worldwide, including about 60,000 engineers and scientists.