U.S. Army Training and Doctrine Command Soldiers salute during the National Anthem at the Army Reserves’ Birthday Celebration Run at Joint Base Langley-Eustis, Va., April 21, 2017. The Army Reserve was established on April 23, 1908 when Congress authorized the Army to form a Medical Reserve Corps. (U.S. Air Force photo/Airman 1st Class Kaylee Dubois)

U.S. Army Soldiers begin a run to honor the Army Reserves’ 109th Birthday at Joint Base Langley-Eustis, Va., April 21, 2017. There are more than 200,000 Army Reserve Soldiers serving around the globe. (U.S. Air Force photo/Airman 1st Class Kaylee Dubois)

U.S. Army Soldiers assigned to the U.S. Army Training and Doctrine Command run in formation to honor the Army Reserves’ 109th Birthday at Joint Base Langley-Eustis, Va., April 21, 2017. Army Reserve Soldiers have participated in every major war campaign, to include the Global War on Terrorism with approximately 218,000 reserve members being activated since 9/11. (U.S. Air Force photo/Airman 1st Class Kaylee Dubois)