Earth Day at Osan Published April 25, 2022 By Staff Sgt. Skyler Combs 51st Fighter Wing Public Affairs Osan Elementary students and Airman volunteers came together to plant trees in front of Osan Elementary School in recognition of Earth Day, 22 April, 2022 at Osan Air Base, Republic of Korea. Each year, more than a billion people celebrate Earth Day by taking part in activities like picking up litter and planting trees.