Reading level:

AGM-86 ALCM

Boeing · Air-to-Surface · USA · Cold War (1970–1991)

The AGM-86 ALCM (Air-Launched Cruise Missile) is an American air-launched nuclear-armed cruise missile that has served as Boeing's principal nuclear-strike weapon for the US Air Force B-52H Stratofortress for four decades. Boeing developed the ALCM between 1974 and 1982, with service entry in December 1982 to replace the older AGM-69 SRAM. Production reached about 1,715 AGM-86Bs (nuclear) plus 322 AGM-86C/D conventional rounds. The AGM-86B remains the only nuclear-tipped air-launched cruise missile in the US arsenal pending entry of its LRSO successor around 2030.

Power comes from a single Williams F107-WR-100 turbofan, giving a top speed of Mach 0.73. The missile is 6.32 m long and weighs 1,458 kg, with a range of 2,400 km. The AGM-86B carries one W80-1 thermonuclear warhead with selectable 5-150 kt yield. Guidance combines INS with TERCOM (Terrain Contour Matching): the radar altimeter reads the terrain profile beneath the missile and compares it against pre-stored digital maps to update INS position fixes, yielding roughly 30 m CEP at full range. A cruise altitude of around 150 m and a low-RCS airframe make detection difficult. Each B-52H carries six ALCMs internally on a rotary launcher plus six on each of two underwing pylons — 20 rounds per sortie.

Service has been continuous since 1982 with the B-52H as sole launch platform. The conventional AGM-86C/D rounds saw heavy combat use: 35 launched against Iraqi targets in 1991 Desert Storm, further launches in 1996 and 1998 Operation Desert Strike against Iraq, 1999 Operation Allied Force against Serbia, 2001-2003 Operation Enduring Freedom over Afghanistan, and Operation Iraqi Freedom from 2003 onwards. The nuclear AGM-86B has never been fired in combat but remains a pillar of the US nuclear deterrent. Replacement comes via the AGM-181 LRSO (Long-Range Standoff Weapon) from around 2030 — longer-ranged, with reduced radar cross-section and improved penetration. A service-life extension keeps the W80-1 warhead and ALCM airframe flying through 2030.

For Kids — a shorter, friendlier version

The AGM-86 ALCM is an American cruise missile. It was built by a company called Boeing. The United States Air Force uses it on a big bomber called the B-52H Stratofortress. Boeing started building it in 1974 and finished in 1982.

The missile flies by itself after being launched from the plane. It uses a small jet engine called a turbofan to stay in the air. It flies lower than most planes to stay hidden from enemy radar. At about 150 meters up, it is harder to spot and bring down.

The AGM-86 is over 6 meters long. That is longer than a small car by quite a bit. It weighs about as much as a small family car. It can fly up to 2,400 kilometers before reaching its target.

The missile has a smart guidance system. It looks at the ground below and matches it to stored maps. This helps it stay on course over very long distances. It can hit within about 30 meters of its target.

One B-52H bomber can carry up to 20 of these missiles at once. The AGM-86 has been the main air-launched nuclear missile for about 40 years. A new missile called the LRSO is planned to replace it around 2030.

Fun Facts

The AGM-86 has been in service since December 1982 — that is more than 40 years!
One B-52H bomber can carry up to 20 AGM-86 missiles at the same time.
The missile flies at only about 150 meters above the ground to avoid radar.
Its range of 2,400 kilometers means it could fly from New York City to Denver and keep going.
The AGM-86 is longer than a full-size pickup truck.
More than 1,700 nuclear versions of this missile have been built.
It uses a clever system that reads the ground below like a map to guide itself.
A brand-new replacement missile called the LRSO is planned to take over around 2030.

Kids’ Questions

How does the AGM-86 know where to go?

The missile has a smart guidance system inside it. It uses a radar that looks at the ground below. Then it matches what it sees to maps stored in its memory. This keeps it on the right path all the way to the target.

Why does the missile fly so low to the ground?

Flying low makes the missile harder for enemy radar to detect. At about 150 meters up, it can hide behind hills and landforms. This helps it reach its target without being brought down.

Which plane carries the AGM-86?

Only the B-52H Stratofortress carries this missile. The B-52H is a very large American bomber. It can hold up to 20 AGM-86 missiles at once, both inside and under its wings.

Will the AGM-86 be used forever?

No, it will not fly forever. The Air Force plans to replace it with a new missile called the LRSO. That change is expected to happen around 2030. The AGM-86 will have served for nearly 50 years by then.

Variants

AGM-86A (cancelled): Shorter prototype. Cancelled 1980 in favour of AGM-86B.
AGM-86B (1982): Nuclear variant. W80-1 warhead.
AGM-86C / D (1990s): Conventional variants. HE and penetrator warheads.

Notable Operators

US Air Force (1982-present): Sole operator. Launched from B-52H Stratofortress.

Frequently Asked Questions

Why has the ALCM stayed in service since 1982?

The ALCM was originally scheduled for replacement in the early 2000s, but its planned ACM (Advanced Cruise Missile, AGM-129) successor was cancelled in 2007, and the LRSO replacement has been repeatedly delayed. Three factors explain the long service life: (1) the W80-1 warhead remains certified and safe after extensive Life Extension Program refurbishment; (2) the B-52H is the only US bomber currently certified to carry nuclear cruise missiles — the B-1B was decertified in 1991 — making the ALCM's B-52H integration institutionally entrenched; and (3) the US lacked a peer-competitor push to accelerate replacement until the late 2010s, after Russian and Chinese nuclear-modernisation programmes. The AGM-181 LRSO is now scheduled for initial fielding around 2030 with full ALCM replacement around 2035.

Sources

Wikipedia — AGM-86 ALCM