1st Lt. Katelyn Potts, 756th Air Refueling Squadron pilot, conducts pre-flight checks on a KC-135R Stratotanker prior to take-off from Tallinn Airport, Estonia, Aug. 7, 2017. Two 459th Air Refueling Wing KC-135s and their crews embarked on a mission to provide en route refueling support to the 175th Wing Maryland Air National Guard as the ANG unit made its way to Estonia to participate in a state partnership program. (U.S. Air Force photo/Tech. Sgt. Kat Justen)