He said that he drew on his service in the Marine Corps in his coaching .
Kenney served in the United States Marine Corps , in combat in Vietnam for 13 months in 1965 to 1966 ; four months were spent as a sniper .
Kenney said that Kenney drew on Kenney 's service in United States Marine Corps   Corps in his coaching .
Kenney served in the United States Marine Corps , in combat in Vietnam for 13 months in 1965 to 1966 ; four months were spent as a sniper .