Air Force Capt. Donald Hart talks with his crew before taxiing a KC-135R Stratotanker aircraft during Baltic Operations 2017 at Powidz Air Base, Poland, June 7, 2017. Hart is a pilot assigned to the 351st Air Refueling Squadron. The exercise is designed to enhance flexibility and invulnerability to strengthen combined response capabilities, as well as demonstrate resolve among allied and partner nations' forces to ensure stability in, and if necessary defend, the Baltic Sea region. Air Force photo by Staff Sgt. Jonathan Snyder