This U.S. Army Officer's Uniform from World War I is a single-breasted, five button uniform tunic made from finished khaki wool and fully lined with brown cotton twill, except for the sleeves which are lined with striped cotton. All buttons are regulation dark finish. The left shoulder bears a patch with the letters "YD," which indicated that this soldier was part of the U.S. Army's 26th " Yankee" Division. This division was activated on July 18, 1917 and was nicknamed the Yankee Division since most of the soldiers were from New England. In September, 1917 the Division was deployed to France. While there the 26th saw a total of 210 days of combat during campaigns in 1917 and 1918 and by the end of the war in November, 1918 the division had lost more than 1,500 men.