Background

Boeing derived the E-6A from its commercial 707 to replace the aging EC-130Q in the performance of the Navy's TACAMO mission. TACAMO links the National Command Authority (NCA) with naval ballistic missile forces during times of crisis. The aircraft carries a Very Low Frequency communication system with dual trailing wire antennas. The Navy accepted the first E-6A in August 1989.

The E-6B was conceived as a replacement for the Air Force's Airborne Command Post due to the age of the EC-135 fleet. The E-6B modified an E-6A by adding battlestaff positions and other specialized equipment. The E-6B is a dual-mission aircraft capable of fulfilling either the no-fail TACAMO mission or the airborne strategic command post mission and is equipped with an airborne launch control system (ALCS), which is capable of launching U.S. land-based intercontinental ballistic missiles. The Navy accepted the first E-6B aircraft in December 1997 and the E-6B assumed its dual operational mission in October 1998. The E-6 fleet was completely modified to the E-6B configuration in 2003.