The Base Closure Act, Public Law 100-526, directs the Secretary of Defense to close and realign all military installations recommended by the Commission on Base Realignment and Closure. As a result of the Commission's recommendations, Lowry Air Force Base, Colorado, will absorb an additional training mission due to the closure of Chanute Air Force Base in Illinois. This Environmental Assessment has been conducted in order to comply with the National Environmental Policy Act (NEPA) of 1969 (Public Law 91-190), which requires Federal agencies to evaluate and disclose the environmental impacts of a proposed Federal action. The EA was prepared in accordance with the Council on Environmental Quality's Regulations for Implementing the Procedural Provisions of NEPA (40 CFR 1500-1508) and Air Force Regulation 19-2, Environmental Impact Analysis Process. Procedural requirements of other pertinent environmental legislation, including the Endangered Species Act, the Fish and Wildlife Coordination Act, and the National Historic Preservation Act, are also addressed and compliance status is documented. Only the effects of the additional mission at Lowry AFB are addressed in this assessment. The effects of the closure of Chanute AFB are being addressed in a separate document. As provided for in the Base Closure Act, the need, purpose, or reason for the realignment does not have to be addressed in the NEPA document. Therefore, the purpose of the action is addressed only to the extent necessary for an understanding of the proposed project. A detailed description of the project is presented in the next section, Alternatives Including the Proposed Action.