China revives Cold War-era fractional orbital bombardment system, evading US missile defenses

Image Credit: Creative Commons

On Friday, the Senate confirmed a general to run the most expensive defense project in American history — a missile shield meant to protect the homeland from weapons that do not fly like missiles at all. The strangest of those weapons is a Cold War ghost: the fractional orbital bombardment system (FOBS), a warhead that rides a partial orbit around the planet and approaches America from a direction its radars were never built to watch.

The Soviets fielded it, then bargained it away at a negotiating table. China resurrected it in 2021 with a twist the Soviets never had. And the table where the first version died no longer exists.

A General Gets the Job

On July 17, the Senate confirmed Space Force Gen. Michael Guetlein by voice vote to lead Golden Dome, President Trump’s plan for a layered shield over the United States — a program whose ultimate cost estimates start north of $175 billion and climb from there.

The quiet vote belied the size of the job: an architecture spanning every service, promising to stop ballistic, hypersonic, and cruise missiles aimed at the homeland, some before they finish launching. To understand why Washington is attempting something this hard and this expensive, it helps to study the weapon that best explains the ambition — because it is the one that makes the existing American warning system look like a fence with an open gate.

Image Credit: Creative Commons

The Weapon That Comes From the South

A fractional orbital bombardment system does something no ordinary missile does. An intercontinental ballistic missile (ICBM) flies a predictable arc: within minutes of launch, radars can compute where it will land. A FOBS instead boosts its warhead into a partial orbit of the Earth, coasts along it like a satellite, and then fires a retrograde engine burn to drop out of orbit onto its target.

Until that deorbit burn, there is no ballistic trajectory to solve and no impact point to compute. Worse, the orbit can run in any direction, including south over Antarctica — entirely around the ballistic-missile early-warning radars that the United States built across the Arctic to face a Soviet attack coming over the North Pole.

When confusion swirled after China’s test, the Space Force’s Lt. Gen. Chance Saltzman cut through it with a definitional scalpel, stressing that "a fractional orbit is different than suborbital" and different from a mere hypersonic missile — a separate class of weapon entirely. The category’s whole purpose is to arrive unannounced, from the wrong direction.

The Soviets Did It First — and Gave It Up

None of this is new, which is part of what makes it unsettling. The Soviet Union fielded the R-36O orbital bombardment missile in 1969, explicitly designed to fly via the South Pole and minimize the warning time of America’s early-warning radars.

The trade-offs were understood even then:

• A fractional-orbit weapon was less accurate than an ICBM
• It carried a smaller warhead
• It was suited to "time-urgent, soft targets" like bomber bases and command centers, rather than hardened silos

In other words, it was a first-salvo weapon, valuable precisely for the surprise it bought.

The United States, for its part, studied the same physics in the 1960s with its X-20 space-bomber project and chose not to build the weapon. The Soviet system served in small numbers for about 14 years, and then the treaty era caught up with it: SALT II, signed in 1979, banned fractional orbital missiles by name, and Moscow deactivated the force by 1983.

A destabilizing weapon was traded away at a table — which is how the first FOBS era ended. It is worth holding on to that detail, because nothing like it is available today.

Image: Creative Commons

July 2021: The Resurrection

The second era began with a mystery. In October 2021, the Financial Times revealed that China had conducted two secretive tests that summer — in late July and mid-August — in which a rocket carried a weapon into a partial orbit of the Earth before it descended toward a target.

The Pentagon’s own China Military Power Report later put the flight at nearly 25,000 miles, the longest of any Chinese land-attack weapon test. By most accounts, the vehicle missed its target by roughly two dozen miles — a poor result for an ICBM and a startling one for a first-of-its-kind system.

What made the test genuinely novel was the payload. The Soviets had capped their orbital missile with an ordinary reentry vehicle. China paired the fractional orbit with a hypersonic glide vehicle — a maneuvering weapon that can fly low, evade interceptors, and disguise its trajectory.