North American XB-70 Valkyrie at the National Museum of the United States Air Force, Dayton, Ohio. (U.S. Air Force photo.)

“The XB-70, Mach 3 Bomber - 1961” Artist: John McCoy.

via defenseimagery.mil

North American XB-70A Valkyrie fuselage final assembly. Photo taken April 22, 1962 after the three fuselage sections had been assembled. (U.S. Air Force photo)

Air Progress. October, 1965.

via JP Dubs

General Dynamics F-111A (S/N 63-9768, third pre-production aircraft) with unswept/swept wings at the aircraft rollout on Oct. 15, 1964. (Photo: U.S. Air Force 1, 2, animgif: me)

Lockheed F-104A-15-LO (S/N 56-0769 and 56-0781) in flight with Lockheed EC-121 (S/N 55-0127).  Photo: U.S. Air Force.

F-100A (S/N 53-1663), F-101 (S/N 53-2430), F-102 and F-104 (S/N 53-7786) on the ramp. (U.S. Air Force photo).

North American XB-70A Valkyrie in flight with wings drooped to 65 percent position. (U.S. Air Force photo)

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North American XB-70A Valkyrie in flight landing configuration, with Convair B-58A flying chase. Note the blotched appearance is due to the white paint being flaked and burned off during the high speed flight portion of the test. (U.S. Air Force photo)

Front view of XF-104 with Lockheed test pilot Tony LeVier. (U.S. Air Force photo)

via: nationalmuseum.af.mil