Designed as a B-52 replacement, The North American Aviation XB-70 Valkyrie is the prototype of the B-70 nuclear-armed, deep-penetration strategic bomber for .
XB-70ヴァルキリー戦略爆撃機：1950年代から60年代に掛けてアメリカ空軍の｢ヴァルキリー計画｣に基づき開発された戦略爆撃機(2機のプロトタイプ.
Created by North American Aviation, this historic film shows the flight test program for the XB-70 Valkyrie at Edwards AFB in California including the first flight at .
