1. Exact Street Address: US Army Yuma Proving Ground, Kofa Firing Range, 3rd Avenue West, Building 3504, Yuma, AZ 85365 2. Sales Tax Certificate: Any purchase if awarded a contract for purchase is issued by the US Govt and generated by the Fort Drum Mission and Installation Contracting Command (Department of the Army). 3. EPA Certificates: I would recommend that you communicate with your supplier outlining the source of solicitation and the nature of the potential purchase, this is for the government.