Franz Steffes, 52nd Civil Engineer Squadron conservation program manager, displays a honey comb tray of a European Honey Bee to Spangdahlem Middle School students during an Earth Day classroom presentation at Spangdahlem Air Base, Germany, April 22, 2015. Earth Day is observed worldwide to promote the environment and spread awareness of the dangers harming it. (U.S. Air Force photo by Staff Sgt. Christopher Ruano/Released)