As a 20-year-old Union private, Doran Stearns of Vermont passed the marksmanship test to join the nation’s first sniper unit, the U.S. Sharpshooters. To pass, he hit 10 out of 10 shots inside a dinner-plate-sized bull’s eye at 200 yards. Stearns served as a sniper for three years in Civil War battles, including Gettysburg. Captured by Confederates in 1864, they confined him in the infamous Andersonville Prison from May to November.