Franklin Roosevelt actually said...
By virtue of the authority vested in me by section 1 of the act of July 9, 1918, c. 143, 40 Stat. 845, 858 (U.S.C., title 10, sec. 1341), it is ordered that, subject to valid existing rights, the public lands in the following-described areas be, and they are hereby, withdrawn from all forms of appropriation under the public-land laws, including the mining laws, and reserved for the use of the War Department as an aerial bombing and gunnery range.
01/22/1941