Fleet Air Reconnaissance Squadrons (VQs) 3 and 4 operate E-6As in the same manner as their EC-130s - as TACAMO (take charge and move out) communications platforms serving as command links to the fleet ballistic missile submarine force.
No Longer There
The E-6 is the airborne portion of the TACAMO Communications System. It provides survivable communication links between the National Command Authority (NCA) and Strategic Forces. The E-6 is a derivative of the commercial Boeing 707 aircraft. Its a long range, air refuelable aircraft equipped with four CFM-56-2A-2 high bypass ratio fan/jet engines with thrust reversers. The weapon system is electromagnetic pulse hardened. It has an endurance of 15+ hours without refueling and a maximum endurance of 72 hours with in-flight refueling. Mission range is over 6000 Nautical Miles (NM). It carries a crew of five officers, nine enlisted aircrewmen, and up to four trainees for TACAMO missions. For ABNCP missions it carries five naval officers, nine naval enlisted aircrewmen, and a eight person battle staff as determined by the United States Strategic Command (J36).