Paratroopers assigned to the 4th Infantry Brigade Combat Team (Airborne), 25th Infantry Division, U.S. Army Alaska, participate in a brigade-level unit run on Joint Base Elmendorf-Richardson, Alaska, Aug. 16, 2018, to commemorate National Airborne Day. Aug. 16, 1940, marked the first official Army parachute jump, validating the innovative concept of inserting United States ground combat forces behind a battle line by parachute, and is a recognized annually as a special day to honor the U.S. Airborne Forces and the first parachute jump of 48 volunteer members of the U.S. Army Parachute Test Platoon. (U.S. Air Force photo by Justin Connaher). Original public domain image from Flickr