The Boeing E-6 Mercury (formerly E-6 Hermes) is an airborne command post and communications relay based on the Boeing 707-300. The original E-6A manufactured by Boeing's defense division entered service with the United States Navy in July 1989, replacing the . This platform, now modified to the E-6B standard, conveys instructions from the to (see ), a mission known as ("Take Charge And Move Out").
"E-6B" redirects here. For the analog flight computer, see E6-B flight computer.
The E-6B model deployed in October 1998 has the ability to remotely control Minuteman ICBMs using the Airborne Launch Control System. The E-6B replaced Air Force EC-135Cs in the Looking Glass role, providing command and control of U.S. nuclear forces should ground-based control become inoperable. With production lasting until 1991, the E-6 was the final new derivative of the Boeing 707 to be built.1
Loading the rest of the article…
Recent changes
Rabbit hole
Where Boeing E-6 Mercury leads. Every connection below has a source: a link in this article, a shared Wikipedia category, or CirrusSearch text similarity. Articles already on your trail are left out.
The E-6B is an upgrade of the E-6A. It includes a battle staff area and updated mission equipment. The flight deck systems were later replaced with a better, cheaper off-the-shelf 737 Next Generation cockpit. The first E-6B was accepted in December 1997. All 16 E-6A aircraft were modified to the E-6B standard, with the final delivery taking place in December 2006.3
Unlike most Navy aircraft that use the probe-and-drogue in-flight refueling method, the E-6 has a flying boom receptacle on the upper-forward fuselage so it can be refueled by the U.S. Air Force’s larger tanker fleet of KC-135 Stratotankers and KC-46 Pegasuses.4
Operational history
Codenamed Looking Glass, the E-6 is United States Strategic Command's (USSTRATCOM) Airborne Command Post (ABNCP). It is designed to take over should the Global Operations Center at Offutt Air Force Base, Nebraska be incapable of communicating with nuclear forces. The term "Looking Glass” reflects the way the ABNCP "mirrors" the GOC's abilities.5
In August 1989, the E-6A, initially named Hermes, entered service with squadron VQ-3. In January 1991, a second squadron, VQ-4, received its first E-6As, allowing the EC-130Q to be phased out in June 1991. In autumn 1991, the E-6A was renamed Mercury at the Navy's request.6 Sixteen E-6A planes were delivered from 1988 to 1992.7
In 2021, one of the E-3D Sentry aircraft in service with the Royal Air Force was purchased for conversion into a dedicated E-6 trainer. This was done to extend the life of the operational fleet by reducing the need for E-6s to be used for training missions.9 In May 2025, the project was canceled, and a new contract was issued to Northrop Grumman for the salvage of spare parts and eventual scrapping of the airframe.10
Replacement
In 2015, both the Air Force and Navy realised that they needed new aircraft to serve the missions of both the E-4 and the E-6. At one point, they considered building one plane to replace both aircraft. In 2020, the Navy developed an aircraft specifically for the TACAMO mission, under the E-XX TACAMO program. The Air Force independently pursued an E-4 replacement under the Survivable Airborne Operations Center program.
The Navy selected a variant of the Lockheed EC-130J, derived from the lengthened C-130J-30. In late 2020, initial orders were placed, with development beginning in earnest in 2022.11 Delivery of the first aircraft is expected in FY26.12 The Navy expects the E-6 to fulfill the TACAMO role into the 2030s as the E-XX is transitioned into service.
In October 2024, the replacement aircraft was officially named E-130J.13
Cruise speed:
Range: 6,600 nmi (7,600 mi, 12,200 km)
Combat range: 6,350 nmi (7,310 mi, 11,760 km)
Endurance: on station at 1,000 nmi (1,200 mi; 1,900 km)
14Lambert, Mark; Munson, Kenneth; Taylor, Michael J.H., eds. (1992). Jane's all the world's aircraft, 1992–93 (83rd ed.). Coulson, Surrey, UK: Jane's Information Group. pp. 349–350. ISBN 0710609876.
Francillon, René J. (1995). "Messenger of the Gods: The Boeing E-6 Mercury in USN Service." Air International, Vol. 48, No 1, January 1995, pp. 19–24.
Breffort, Dominique (2008). Boeing 707, KC-135 and Civilian and Military Versions. Paris: Histoire & Collections, 2008. ISBN 978-2-35250-075-9, pp. 93–94
DickClarkMises§ Operational historyrm footnote making claim irrelevant to the content of the article−238diff
SwatjesterRestored revision 1342597441 by ~2026-15108-00 (talk): We should get better sourcing than this -- Militarnyi is not a great source for US military deployments in the Middle East, and there is no indication that an E-6 has (or would be) deployed to the region−328diff
