When, as a result of combat operations, the Armed Forces establish military cemeteries in zones of operations outside the United States and the territories and possessions of the United States, the American Battle Monuments Commission and the Secretary of the Army, immediately on the cessation of hostilities, shall decide which of the cemeteries will become permanent cemeteries or, if they decide it is desirable, shall select new sites for the cemeteries at any other location. The Commission is solely responsible for the design and construction of the permanent cemeteries, and of all buildings, plantings, headstones, and other permanent improvements incidental to the cemeteries, except that—