Route Program, carried out jointly by the Federal Aviation Administration and the Secretary of Defense, for use by the armed forces for the purpose of conducting low-altitude, high-speed military training. (7) The term unacceptable risk to the national security of the United States means the construction, alteration, establishment, or expansion, or the proposed construction, alteration, establishment, or expansion, of a structure or sanitary landfill that would— (A) endanger safety in air commerce, related to the activities of the Department of Defense