GREAT LAKES, Ill. (Sept. 21, 2017) Command Sgt. Maj. John Troxell, senior enlisted advisor to the chairman of the Joint Chiefs of Staff, visits Recruit Training Command (RTC) Sept. 21. Troxell, seen here touring Freedom Hall, serves as the principal military advisor to the chairman and the Secretary of Defense on all matters involving joint and combined total force integration, utilization, health of the force and joint development for enlisted personnel. (U.S. Navy photo by Mass Communication Specialist 3rd Class Sean Kent/Released)