9/24/2012 - Herschel Walker, former NFL running back, speaks to members of the Luke Air Force Base community at Luke AFB, Ariz., Sept. 21, 2012. Walker shared his personal story and experience with mental illness and the importance of asking for help when needed. His visit to Luke was in partnership with The Freedom Care Program Anti-Stigma Campaign. (U.S. Air Force photo by Staff Sgt. Jason Colbert)

9/24/2012 - Herschel Walker, former NFL running back, sits in an F-16 Fighting Falcon while Maj. Matt Busch, 56th Training Squadron assistant director of operations, explains the controls of the aircraft at Luke Air Force Base, Ariz., Sept. 21, 2012. Walker visited Luke in partnership with The Freedom Care Program Anti-Stigma Campaign He spoke with members of the Luke community about his experiences and was treated to a flightline tour to culminate his visit. (U.S. Air Force photo by Staff Sgt. Jason Colbert)

9/24/2012 - Herschel Walker, former NFL running back, signs memorabilia for Petty Officer 2nd class Marcus Jones, Navy Operational Support Center administrative clerk, at Luke Air Force Base, Ariz., Sept. 21, 2012. Walker visited Luke in partnership with The Freedom Care Program Anti-Stigma Campaign. (U.S. Air Force photo by Staff Sgt. Jason Colbert)