Sierra Nevada’s first test flight of the Survivable Airborne Operations Center marks a major step in replacing the aging E-4B “Nightwatch” fleet introduced in the 1970s. The E-4C Survivable Airborne Operations Center (SAOC), the U.S. Air Force’s replacement for the aging E-4B “Nightwatch” fleet, has entered flight testing. Prime contractor Sierra Nevada Corporation (SNC) announced […]