Henry Ladd Stickney (1871-1948), is the soldier on the far right. He was stationed at Camp Greenleaf in Chattanooga, Tennessee, in 1917, during World War I. While there he visited Lookout Mountain and Umbrella Rock, shown in this photo.
Manfred von Richthofen petting his dog on an airfield. Manfred Albrecht Freiherr von Richthofen (5/2/1892-4/21/1918), also widely known as the Red Baron, was a German fighter pilot with the Imperial German Army Air Service (Luftstreitkräfte) during World War I. He is considered the top ace of that war, being officially credited with 80 air combat victories.