The Pentagon Is Canceling Its Arctic Missile-Warning Satellite. The Replacement Is Behind Schedule.

The Pentagon says it can stop watching the polar region for missile launches — because a new satellite network will already be running by the time the old program shuts down. The schedule for that new network is five months behind.

Northrop Grumman said April 30 it had accepted delivery of the sensor for Next-Gen OPIR Polar, a satellite program designed to watch the northern polar region. The same day, the proposed FY2027 budget disclosed that the Space Force intends to terminate the program and provides no further funding. The stated reason: a proliferated constellation of tracking satellites in low and medium Earth orbit — what the budget calls the LEO and MEO layers — will provide the same coverage.

The LEO layer is behind. The Space Development Agency's operational tracking constellation, called Tranche 1, was supposed to begin launching last November. It has been paused since then, with restart targeted for May or June of this year — five months of delay with a new launch window that itself carries no firm guarantee. The MEO layer, a separate set of satellites called Epoch 1, is not scheduled to launch until 2027. Epoch 2 follows in late 2028.

The polar region is not optional for missile warning. The shortest ballistic and hypersonic missile flight paths from Russia and North Korea to North America cross the Arctic. The argument for canceling Next-Gen OPIR Polar is that lower orbits can see the pole. The argument the FY2027 budget documents do not make is what covers the gap between now and when those lower-orbit satellites are operational.

The program's cost is $3.4 billion total, with $2.1 billion already spent. The budget allocates $436 million in 2026 to close out development. Congress has already tried to stop the cancellation: language in the 2026 appropriations bill prohibits the Defense Department from using funds to pause, cancel, or terminate either the polar or geosynchronous elements of Next-Gen OPIR. The FY2027 termination proposal is a direct override of that restriction.

The sensor Northrop delivered on April 30 was built for a satellite that will not launch. The company's position is that the delivery keeps the program on schedule — a schedule the Pentagon's own budget now disclaims. The Space Force's proposers have decided the LEO and MEO layers will be ready. Their own agency's launch records suggest otherwise.

The broader Next-Gen OPIR program has had eight years and no satellites in orbit. The geosynchronous portion has been cut from three spacecraft to two, with costs now at $9.1 billion and the first launch still targeting no earlier than 2025. The polar piece is what the budget wants to eliminate — it is the only part of the architecture that covers the region geosynchronous satellites cannot see. The coverage argument hinges entirely on whether the replacement stays on its current timeline. It already has not.