US Navy's Doomsday Fleet to Nearly Double: 31 E-130Js to Replace 16 E-6B Mercuries

The US Navy plans to buy 31 E-130J Phoenix II aircraft to take over the TACAMO mission, nearly double the 16-aircraft fleet flying it today, according to a Modernized Selected Acquisition Report dated April 21, 2026 and prepared for the FY2027 budget request. The figures were reported on August 10 by The War Zone and Aviation Week.

The buy splits into six pre-production aircraft and 25 production examples. The report puts the average procurement unit cost of a production aircraft at $360.9 million, and the program acquisition unit cost, which spreads development across the whole fleet, at $732.8 million. The airframe underneath is a Lockheed Martin C-130J-30 Super Hercules, a stretched variant of a transport that typically sells for around a third of that figure; the difference is the mission system. Northrop Grumman won a $3.5 billion contract in December 2024 to integrate it, including the Collins Aerospace very low frequency radio suite, into government-furnished airframes.

TACAMO, for Take Charge And Move Out, is the airborne relay that would pass launch orders to the United States' submarine-based deterrent if ground stations were destroyed. The aircraft trails a wire antenna several kilometres long to reach submerged boats on very low frequency, a link that has to survive the opening minutes of a nuclear exchange. It is the reason the fleet is sized the way it is: the mission demands continuous airborne alert, not surge capacity.

The aircraft doing that job today is the E-6 Mercury, and GlobalMilitary.net records show why the recapitalization matters. Just 16 were built, none exported, and the US inventory has stood at 16 aircraft every year since 2020. The type entered service in 1989 and was the last new-build application of the Boeing 707, a production line that closed in 1991. The fleet has no attrition margin whatsoever. Losing one airframe is a 6 percent cut in the force.

The E-6B also carries a second job, Looking Glass, serving as an airborne command post for US Strategic Command alongside the four E-4 National Airborne Operations Center jets. Public reporting has not settled whether the E-130J inherits that role or whether it passes elsewhere.

Schedule is the weak point. The report sets a critical design review for September 2027 and a Milestone C production decision for August 2029, with initial operational test and evaluation starting no earlier than June 2033. The date for initial operational capability is classified. That leaves the 1989-vintage Mercury fleet carrying the mission into the mid-2030s, and the Navy has been funding upgrades to it in parallel, including a Collins Aerospace modernization contract awarded in January 2026.

The timing sits alongside the rest of the American deterrent recapitalization. The Navy awarded $29.5 billion in July 2026 for five Columbia-class Build II boats, the submarines that replace the 14 Ohio-class hulls the TACAMO aircraft exist to talk to. Both legs of that pairing, the boats and the radio link, are being replaced at once, and both run into the 2030s before the new equipment is operational. Fleet totals and warhead estimates for every declared arsenal are tracked on our nuclear forces overview.

Next milestones are the critical design review in September 2027 and first flight of a converted test aircraft, for which the Navy has not published a date.