U.S. Navy upgrades E-6B comms while its replacement takes shape

The U.S. Navy is upgrading the communications suite on the E-6B Mercury, an airborne nuclear relay aircraft, even as the service moves forward with the E-130J Phoenix II, the platform eventually set to replace it.

Naval Air Systems Command published a presolicitation notice on May 1, 2026, announcing its intent to award a sole-source delivery order to Rockwell Collins, Inc., doing business as Collins Aerospace Government Systems Division, for non-recurring engineering work to integrate a Wideband High Frequency radio suite onto the E-6B airframe. The work falls under the Navy’s Airborne Strategic Command, Control and Communications Program Office, known as PMA-271, and will be structured as a Cost Plus Fixed Fee delivery order under an existing Basic Ordering Agreement previously awarded to Collins Aerospace on a sole-source basis. No contract value appears in the presolicitation notice.

The E-6B Mercury is one of the most strategically significant and least publicly discussed aircraft in the American military inventory. Built on the Boeing 707 airframe and operated by the Navy, it performs two linked missions: Airborne Command Post and Take Charge and Move Out — TACAMO — a mission whose name is blunt about its purpose. If a nuclear first strike destroys America’s ground-based command infrastructure, the E-6B is supposed to be airborne, intact, and still capable of transmitting launch orders to ballistic missile submarines running deep and silent beneath the ocean’s surface. It carries a Very Low Frequency trailing wire antenna — miles of wire unreeled in flight — that can reach submarines operating too deep for conventional radio signals. The aircraft has been performing this mission since the late 1980s, when it replaced the EC-130Q Hercules in the TACAMO role.

That lineage matters now because PMA-271 — the same program office managing the E-6B upgrade — and Strategic Communications Wing 1 officially named the E-6B’s eventual successor in October 2024. According to an early report, the Navy formally designated the next-generation TACAMO aircraft the E-130J, carrying the popular name Phoenix II. “Phoenix II is the ideal popular name as we take the E-130J TACAMO mission into its next phase,” Capt. Roger Davis, PMA-271 program manager, said in the announcement. “A phoenix is known for its resilience, exceptionally long lifespan, and its ability to transform and continue its purpose.” The name is a deliberate callback — TACAMO originally flew on the EC-130Q variant of the C-130 platform from 1963 to 1993, before the Navy transitioned to the E-6B. The E-130J Phoenix II returns the mission to a C-130-based airframe after more than three decades on the Boeing-built Mercury.

With a successor named and in development, the question of why the Navy is spending money now to upgrade the E-6B’s communications suite answers itself. The E-130J isn’t in service yet, and the E-6B fleet has to keep performing its mission in the meantime — a mission that sits at the top of the American nuclear command and control architecture and cannot be allowed to degrade while a replacement program matures. Wideband High Frequency radio extends the capability of standard HF communications, which has long been valued in military aviation for its ability to bounce signals off the ionosphere and reach receivers thousands of miles away without line-of-sight limitations. Adding wideband capacity means greater data throughput and improved resistance to interference — qualities that carry particular weight when the communications link in question is the one that authorizes nuclear weapons employment.

According to the NAVAIR notice, the delivery order covers development of an integration technical data package, System Integration Lab installation and testing for risk reduction, validation and verification installations, and procurement of A-kits, B-kits, spares, and training. A-kits are the structural and wiring provisions installed in the airframe to accept the new system; B-kits are the actual radio equipment, antennas, and associated hardware going in. Running the full SIL test program before touching operational aircraft is standard practice for high-stakes avionics integration — find the problems in the lab, not on the flight line.