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U.S. Government Accountability Office - Investigative arm of Congress charged with examining matters relating to the receipt and payment of public funds.
U/I - Unit of Issue
UCF - Uniform Contract Code
Unilateral Modification - A contact modification that is signed only by the CO. Used to make administrative changes; issue change orders; or make changes authorized by other than a "changes" clause.
USAID - US Agency for International Development
USCIC - US Citizenship and Immigration Services
USDA - United States Department of Agriculture