A Soldier with Headquarters and Headquarters Troop, 3rd Armored Brigade Combat Team, 1st Cavalry Division studies the perimeter before his guard duty April 26 at Fort Irwin, Calif. During low light hours, Soldiers wear night vision goggles to help them keep their area secure. (U.S. Army photo by Sgt. Brandon Banzhaf, 3rd Armored Brigade Combat Team, 1st Cavalry Division/Released)