"one of the four AIM-9s carried by the F-8 had already experienced a failure before take off."
"Schaffert shot another missile which failed to explode."
"all the four 20 mm cannons…choked! The problem was caused by a common defect of Crusader cannons: the pneumatic ammunition feed system disconnected after high-Gs maneuvers."
Sounds like a problem with the equipment or their design/manufacture.
Or the armorers.