President Barack Obama, left, shakes hands with U.S. Army Sgt. Richard Z. Pyle, assigned to Battle Company, 2nd Battalion, 503rd Infantry Regiment, 173rd Airborne Brigade Combat Team, during a troop event in Tallinn, Estonia, Sept. 3, 2014. Obama spoke with U.S. paratroopers and Estonian soldiers supporting Operation Atlantic Resolve during the event. Europe-based U.S. Army units were deployed to Poland, Lithuania, Estonia and Latvia to conduct bilateral military exercises and reinforce NATO security commitments to the host nations.