EDWARDS AIR FORCE BASE, Calif. (Jan. 27, 2017) Photos of a Navy E-6B Mercury aircraft conducting flight tests at various altitudes out of Edwards Air Force Base. The E-6B Mercury functions as a communications relay and strategic airborne command post, and is capable of providing command and control functions for U.S. strategic and non-strategic forces, to include naval ballistic missile forces. (U.S. Air Force photo by Christopher Okula)