Barbell Thruster Air Force Senior Airman Frank Lopez performs a barbell thruster during the 31 Heroes competition at Luke Air Force Base, Ariz., Aug. 4, 2017. The competition honored the lives of 31 military members who died in a helicopter crash in Afghanistan in 2011. Air Force photo by Airman 1st Class Caleb Worpel SHARE: Download: Full Size (1.65 MB) Credit: Airman 1st Class Caleb Worpel VIRIN: 170804-F-AP587-0569Y.JPG Photo Gallery