James Avery
Doing the voice of Shredder in the Teenage Mutant Ninja Turtles did not constitute as the military service of James Avery, but something else did. His real service to his country was during the Vietnam War between 1968 and 1969.
Montel Williams
Many of the celebrities on this list have decided to keep their military careers quiet, but Montel Williams is not one of them. He served in the Marine Corps for more than 10 years and received a number of decorations for his service. When the time came, he was discharged honorably with the rank of Midshipman.