Ahtna Development Corporation was formed in 1975 to pursue business opportunities that would enhance the economic well being of native Alaskans. Now a certified Tribal 8(a) company, it is a subsidiary of Ahtna, one of several Alaska Native Regional Corporations established by Congress under the terms of the Alaska Native Claims Settlement Act of 1971. ADC s core business since 1975 has been operations and maintenance with specialization in Deparment of Defense sites worldwide. It is an American Indian-owned enterprise that assists contractors in civil and environmental construction industries. Ahtna is headquartered in Glennallen, Alaska, and maintains an ADC office in Anchorage, Alaska.