Chief Master Sgt. Steve McDonald, Pacific Air Forces command chief, shakes hands with Airman 1st Class Trevor Gibbins, 15th Maintenance Squadron aerospace maintenance apprentice, during a tour with 15th Maintenance Group Airmen at Hangar 21, Joint Base Pearl Harbor-Hickam, Hawaii, March 27, 2013. During the tour McDonald thanked each of the units and spoke of the importance of their missions. (U.S. Air Force photo/Tech. Sgt. Jerome S. Tayborn)