Chet Blalock, who moved his martial arts gym from Chattanooga to Fort Oglethorpe, Ga., trained Mohammod Youssuf Abdulazeez. Here, Mr. Blalock works with a student. Mr. Blalock said Mr. Abdulazeez was extreme in his training, sometimes allowing himself to be choked to the point of unconsciousness. “It’s a bit on the extreme side, even for mixed martial arts,” Mr. Blalock said. Police say Mr. Abdulazeez killed five military members, four Marines and a Navy sailor, in a shooting rampage on July 16, 2015 in Chattanooga, Tenn. Photo by Kevin Liles for The New York Times
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