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USIS is a U.S. government contractor that specializes in conducting investigations for U.S. government agencies. Its corporate headquarters are in Idylwood, Virginia, near Falls Church, in Greater Washington, D.C. USIS employees and contractors conduct field work for U.S. government national security clearances through contracts with the United States Office of Personnel Management (OPM) Federal Investigative Services (FIS) and the U.S. Department of Homeland Security. USIS is a part of Altegrity Inc., a company headquartered in the Falls Church area that is owned by Providence Equity Partners.