Staff Sgt. Justin Baldivia, 4th Equipment Maintenance Squadron, explains hydraulic purification capabilities for the F-15E Strike Eagle to Chief Master Sgt. of the Air Force Rodney McKinley on Seymour Johnson Air Force Base, June 12. Chief McKinley is the 15th CMSAF and serves as adviser to the Chief of Staff and the Secretary of the Air Force on issues regarding the enlisted force. (U.S. Air Force photo/Senior Airman Makenzie Lang)