The British Royal Air Force (RAF) Eurofighter Typhoons line up for post-flight checks at Langley Air Force Base, Va., Dec. 3, 2015.The aircraft will be part of a Trilateral Exercise that will simulate a highly-contested, degraded and operationally-limited environment where U.S., partner pilots and ground crews can test their readiness and enhance interoperability through combined operations. (U.S. Air Force photo by Senior Airman Kimberly Nagle)