U.S. Air Force Senior Airman Teric Melhaff, a crew chief with the 31st Aircraft Maintenance Squadron, conducts a preflight check on an F-16 Fighting Falcon aircraft in Campia Turzii, Romania, April 10, 2014, during Dacian Viper 2014. Dacian Viper is a bilateral air exercise designed to enhance interoperability and readiness between the U.S. Air Force and the Romanian air force.