U.S. Sen. Brian Schatz and Miranda A. Ballentine, assistant secretary of the Air Force for Installations, Environment, and Energy, view a spoke wheel medium wind power system during a tour of the Air Force Energy Security Integration and Demonstration Center, Aug. 26, 2015, at Joint Base Pearl Harbor-Hickam. The objective of the center is to establish the first Air Force integrated energy test bed to demonstrate the best energy solution in response to operational demands. (U.S. Air National Guard photo by Senior Master Sgt. Kristen Stanley /released)