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Development of Airborne Armament 1910-1961, Volume II Bomber Defense, AFSC Historical Publications Series 61-52-(2), Air Force Systems Command, October 1961.
The discussion of the B-70 includes some mention of Pye Wacket. Note that it is referred to as the DAMS system.
In 1959 "The Lenticular [Defence] Missile, a highly unorthodox lens-shaped device that resembled nothing so much as a flying saucer, was an element of the Defensive-Anti-Missile-System (DAMS) then being developed under Wright Air Development Center auspices." A cylindrical missile propsal was preferred by North American for the B-70, as both lower cost and lower risk, and adequate to the threat of frontal attack from the forward hemisphere. "Should an enemy interceptor with better than Mach 3 speed appear, however, spherical coverage 'might become justified.' The lenticular missile, with an appealing growth potential, seemed deserving of further study, particularly on this score."
Other remarks show that the DAMS defence system [i.e. Pye Wacket], was envisaged as having a nuclear warhead and that, even though the B-70 was the main subject of the discussion and North American were asked to study the DAMS system, the work "would not be tied to the B-70".
The nuclear warhead was being considered for a novel kill mode called "dudding"; blasting the enemy warhead, also assumed to be nuclear, with a dense cloud of neutrons, sufficient to render it inoperative, i.e. a dud. Thus, even if it subsequently triggered, it would not detonate and the bomber crew would not be exposed to any harmful radiation. It was seen as "the only practical and effective [bomber] penetration aid presently known that can defeat a nuclear warhead without detonating it."