From left, U.S. Air Force Gen. Frank Gorenc, commander of U.S. Air Forces in Europe (USAFE), British Royal Air Force Chief of the Air Staff, Air Chief Marshall Sir Andrew Pulford, Chief of Staff of the U.S. Air Force Gen. Mark A. Welsh III, French air force Deputy Chief of the Air Staff Gen. Antoine Creux, and U.S. Air Force Gen. Hawk Carlisle, commander of Air Combat Command, pose for a photo during the Trilateral Exercise at Langley Air Force Base, Va., Dec. 15, 2015. The exercise, which aims to give coalition forces an opportunity to hone skills during simulated adversarial scenarios, kicked off Dec. 2, 2015 and is scheduled to conclude Dec. 18, 2015. (U.S. Air Force photo by Tech. Sgt. Katie Gar Ward)