The United Technologies Corporation (UTC) is an American multinational conglomerate. It researches, develops, and manufactures high-technology products in numerous areas, including aircraft engines, helicopters, heating and cooling, and fuel cells, among others. UTC is also a large military contractor, producing missile systems and military helicopters, most notably the UH-60 Black Hawk helicopter. UTC is one of seven companies contracted by the Department of Homeworld Security for the production of Stargate-related technologies, and contributes to one wing of the Triton Spaceworks Assembly Corporation.