John Walker is a member of the U.S. Army who first competed in Miami in American Ninja Warrior 5. In Qualifying, his run was digested but it was shown that he finished the course with the 13th fastest time. In the city finals, his run was digested but it was shown that he failed the Salmon Ladder, he did place 14th overall and moved on to the national finals. His run on Stage 1 was cut but it was revealed that he failed the Jumping Spider.
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