((a)) ** Frequencies; compliance with regulations; stations on vessels** Radio stations belonging to and operated by the United States shall not be subject to the provisions of sections 301 and 303 of this title. All such Government stations shall use such frequencies as shall be assigned to each or to each class by the President. All such stations, except stations on board naval and other Government vessels while at sea or beyond the limits of the continental United States, when transmitting any radio communication or signal other than a communication or signal relating to Government business, shall conform to such rules and regulations designed to prevent interference with other radio stations and the rights of others as the Commission may prescribe.

((b)) ** Call letters** All stations owned and operated by the United States, except mobile stations of the Army of the United States, and all other stations on land and sea, shall have special call letters designated by the Commission.

((c)) ** Stations operated by foreign governments** The provisions of sections 301 and 303 of this title notwithstanding, the President may, provided he determines it to be consistent with and in the interest of national security, authorize a foreign government, under such terms and conditions as he may prescribe, to construct and operate at the seat of government of the United States a low-power radio station in the fixed service at or near the site of the embassy or legation of such foreign government for transmission of its messages to points outside the United States, but only (1) where he determines that the authorization would be consistent with the national interest of the United States and (2) where such foreign government has provided reciprocal privileges to the United States to construct and operate radio stations within territories subject to its jurisdiction. Foreign government stations authorized pursuant to the provisions of this subsection shall conform to such rules and regulations as the President may prescribe. The authorization of such stations, and the renewal, modification, suspension, revocation, or other termination of such authority shall be in accordance with such procedures as may be established by the President and shall not be subject to the other provisions of this chapter or of subchapter II of chapter 5, and chapter 7, of title 5.