U.S. Air Force F-16 Fighting Falcons assigned to the 120th Fighter Squadron, Colorado Air National Guard, perform air-to-air refueling from a KC-135 Stratotanker assigned to 171st Air Refueling Squadron, Michigan ANG as a part of Saber Strike 18, over the Baltic Sea June 18, 2018. Saber Strike 18 is the eighth iteration of the long-standing U.S. Army Europe-led cooperative training exercise designed to enhance interoperability among allies and regional partners, while focusing on improving land and air operational capabilities and train with NATO’s enhanced Forward Presence (eFP) battlegroups.