U.S. Air Force Senior Airman Christian Klimek, 100th Aircraft Maintenance Squadron flying crew chief, preps the boom operator pod prior to take-off for refueling training with Romanian air force F-16s in Bucharest, Romania, March 13, 2019. The training was an example of U.S. and NATO allies sharing a commitment to promote peace and stability through developing their relationship and communication process. (U.S. Air Force photo by Airman 1st Class Brandon Esau)