This is the story of the largest Mach 3 aircraft ever flown the North American Aviation XB-70A Valkyrie. Dennis R. Jenkins and Tony R. Landis have conducted extensive research in military, NASA, and company archives to find previously uncovered aspects of this fascinating program. Includes descriptions of the proposed bombing and navigation systems, defensive armament, electronic countermeasures, and early attempts at stealth technology. Accompanied by over 250 photos and dozens of illustrations, this in-depth history covers the entire B-70 program, not just the two aircraft that ultimately flew.