English: Ulrich Knuff, Ramstein forester, explains the importance of keeping the roots of a young tree moist while re-planting to a group of children from the Ramstein Elementary School April 22, 2015, at Ramstein Air Base, Germany. Knuff helped the group of second graders plant more than 100 trees as part of Earth Day 2015. The class also worked with the Boy and Girl Scouts of the United States of America to clean road borders leading to Ramstein. (U.S. Air Force photo/Staff Sgt. Sara Keller)