A British soldier with the 5th Battalion, The Rifles, 20th Armored Brigade, pulls security in front of a UH-60L Black Hawk helicopter during a training exercise at Saase, Estonia, Aug. 9, 2017. The British unit is currently working in Estonia as a part of Operation Atlantic Resolve, which is a NATO mission involving the U.S., allied and partnered nations in Europe in an effort to enhance regional stability and to deter aggression. Army photo by Pfc. Nicholas Vidro