U.S. Air Force Chief Master Sgt. Matthew Grengs, the command chief of the 52nd Fighter Wing, volunteers for the dunk tank during a military appreciation day at the Eifel Lanes Bowling Center on Spangdahlem Air Base, Germany, July 4, 2013. The 52nd Force Support Squadron sponsored the community event to celebrate Independence Day. (U.S. Air Force photo by Airman 1st Class Gustavo Castillo/Released)