From their About Us page:
The USO (United Service Organizations) lifts the spirits of America’s armed forces and their families. We provide a touch of home to troops wherever they serve through centers at airports and military bases around the world, top quality entertainment and innovative programs and services tailored to meet the needs of troops and their families. The USO is not a government agency and relies on the generosity of the American people. The USO is also supported by Worldwide Strategic Partners AT&T Inc., BAE Systems, The Boeing Company, Clear Channel Communications, The Coca-Cola Company, Gallery Furniture, Lockheed Martin, Microsoft Corporation, Northrop Grumman Corporation, S & K Sales Co. and TriWest Healthcare Alliance. Other corporate donors, including the United Way and Combined Federal Campaign (CFC-11381), have joined millions of individual donors to support the USO.