Fans of the book may be disappointed.
The gunman in a mass killing in Allen, Texas, is among 32 recruits who washed out of the military and went on to commit extremist crimes.
One-quarter of all extremism-driven mass casualty attacks and plots from 1990 through 2022 were devised by perpetrators with military backgrounds.
Sgt. Maj. Steven Burkett has even swung some kettlebells with then-Commandant Gen. Robert Neller.
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