Team Andrews volunteers pick up trash and spread gravel on a trail here to recognize the 44th Annual Earth Day, April 22, 2014. The trail is primarily used by team members for walking and running. (U.S. Air Force photo/Airman 1st Class Ryan J. Sonnier)

Gravel is placed into the bed of a machine to be delivered to various locations on a trail here as part of Earth Day, April 22, 2014. Earth Day was first celebrated on April 22, 1970. (U.S. Air Force photo/Airman 1st Class Ryan J. Sonnier)

Members of Joint Base Andrews gather to spread gravel on worn areas of a trail here in recognition of the 44th Annual Earth Day, April 22, 2014. Earth Day is celebrated to focus on environmental clean-up and awareness. (U.S. Air Force photo/Airman 1st Class Ryan J. Sonnier)