U.S. Air Force Airmen 1st Class Alexander Hartman and Patrick Chittenden, 354th Civil Engineer Squadron water and fuels system maintenance technicians, secure hoses to a generator designed to vacuum up liquid waste that has pooled on the ground during a simulated 4.2-million gallon fuel spill exercise June 17, 2015, at Eielson Air Force Base, Alaska. The exercise is a federal requirement conducted tri-annually to train and prepare fuels management and emergency services personnel in minimizing the environmental impact of a spill and in protecting and preserving public health and safety.