E-6B Mercury

The Boeing E-6 Mercury is an airborne command post and communications relay based on the Boeing 707-320. The original E-6A manufactured by Boeing's defense division entered service with the United States Navy in July 1989, replacing the EC-130Q. It conveyed instructions from the National Command Authority to fleet ballistic missile submarines, a mission known as TACAMO (Take Charge and Move Out). The E-6B model deployed in October 1998 kept this role, but added further command post capabilities and control of land-based missiles and nuclear-armed bombers. The E-6B replaced Air Force EC-135Cs in the "LOOKIN GLASS" role, providing command and control of U.S. nuclear forces should ground-based control become inoperable.