; NAS The terms National Airspace System and NAS have the meaning given such terms in section 245.5 of title 32, Code of Federal Regulations. (5) Unmanned aircraft system The term unmanned aircraft system has the meaning given such term in section 44801 of title 49, United States Code. (b) In general Not later than 180 days after the date of the enactment of this Act, the Secretary of Homeland Security, in coordination with the Attorney General, the Administrator of the Federal Aviation Administration, the Secretary of State, the Secretary of Energy, the Director of National Intelligence, and the Secretary of Defense to develop a strategy for creating a unified posture on C–UAS capabilities and protections at— (1) covered facilities or assets along international borders of the United States