Key Points and Summary – The U.S. Air Force has unveiled the first official rendering of its next-generation nuclear cruise missile, the AGM-181 Long-Range Stand-Off (LRSO).
-Designed by Raytheon, the LRSO is a stealthy, subsonic cruise missile intended to replace the aging AGM-86B Air-Launched Cruise Missile (ALCM).
-It will be armed with the updated W80-4 thermonuclear warhead and serve as a primary nuclear weapon for the B-52J and B-21 Raider bombers, beginning around 2030.
-The design prioritizes stealth and long-range, low-altitude flight to penetrate advanced enemy air defenses, ensuring a credible air-launched leg for the U.S. nuclear triad for decades.
USAF Unveils A Sneak Peek Of the AGM-181 Nuclear Cruise Missile
The United States Air Force released the first rendering of the secretive AGM-181 Long-Range Stand-Off missile (LRSO) on the Pentagon’s media service, Defense Visual Information Distribution Service (DVIDS).
The AGM-181 Long Range Stand-off (LRSO) Cruise Missile is a long-range, survivable stand-off weapon capable of delivering lethal nuclear effects on strategic targets, replacing the currently fielded AGM-86 Air-Launched Cruise Missile (ALCM).
The missile, being developed by Raytheon, will be the primary nuclear weapon for the B-52 and the upcoming B-21 Raider, beginning around 2030.
Of course, the artist’s rendering must be taken with the proverbial grain of salt since it is always different than the actual weapon. However, one can reasonably assume that the actual design will be stealthy.
The program is a top priority for the Air Force and its Global Strike Command. The Air Force plans to use the LRSO to replace America’s only nuclear-armed cruise missile in operation today, the AGM-86B Air Launched Cruise Missile (ALCM), which has served since the end of the Cold War.
Upgrading The Air Force’s Nuclear Triad
The LRSO is a priority for the Air Force as the US works to modernize its nuclear triad. The missile has been defined as a critical capability for the B-21 Raider. The new stealth bomber is set to be equipped with three nuclear weapons: the AGM-181 LRSO cruise missile and the B61-12 and B61-13 bombs, with the latter used exclusively by the Raider.
The modernization of the nuclear triad comprises Intercontinental Ballistic Missiles (ICBMs), Submarine-Launched Ballistic Missiles (SLBMs), Nuclear Command and Control Communications, as well as heavy bombers.
What Are The AGM-181 LRSO Capabilities?
While the capabilities of the new LRSO are classified, certain assumptions can be made with a fair degree of certainty.
The stealth capability of the LRSO is expected to surpass that of its predecessor, the AGM-86B. The rendering shows an angled design that will minimize its radar target signature. It is also likely to be coated with radar-absorbing materials, which will further reduce its radar signature.
The LRSO weapon system will be capable of penetrating and surviving advanced Integrated Air Defense Systems (IADS) from significant stand-off ranges to prosecute strategic targets in support of the Air Force’s global attack capability and its core function of strategic deterrence.
It is expected that the LRSO will be nearly identical in dimensions to the AGM-86. At 21 feet long and 24.5 inches in diameter, it will be capable of being carried by the B-52 and the B-21 Raider stealth bombers, as well as being a small target for enemy radar screens.
Alex Hollings from Air Power and Sandboxx writes, “Like the AGM-86, it’s generally expected that this new weapon will be subsonic, which might surprise some. Yet, stealthy, subsonic cruise missiles are much harder to detect than hypersonic glide vehicles.
“These weapons can fly at low altitudes, hiding behind the curvature of the Earth and then the terrain itself to avoid interception as they close with their targets.
“Subsonic performance also allows for more efficient propulsion that will translate to significantly greater range than a supersonic or hypersonic weapon of the same scale. It also allows it to produce far less heat, which mitigates its infrared signature, making it harder for infrared-guided weapons to chase it.”
The LRSO has been in secretive flight testing for the past three to five years, and it will feature the updated W80-4 thermonuclear warhead.
The weapon is also part of the larger Long Range Strike family of systems, which includes the B-21 as its centerpiece, as well as new command and control, space-based support assets, weapons, communications, and other technologies, possibly including classified fixed-wing companion aircraft.
These capabilities will work together to become something greater than the sum of their parts, enabling success in a future combat environment that will be far more challenging than any in the past.
The Air Force’s budget for fiscal 2025 shows LRSO’s funding set to rise dramatically from $295.5 million in fiscal 2026 to $1.22 billion in fiscal 2027. The Air Force plans to produce a total of 1,087 units. The most recent unit cost estimate is $14 million per LRSO missile.
The Air Force plans to deliver the updated W80-4 warheads in 2027, with full-scale production of the missile to follow shortly after.
About the Author:
Steve Balestrieri is a National Security Columnist. He served as a US Army Special Forces NCO and Warrant Officer. In addition to writing on defense, he covers the NFL for PatsFans.com and is a member of the Pro Football Writers of America (PFWA). His work was regularly featured in many military publications.
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