What Are JDAMs? And What Will They Do For Ukraine?

An American weapon first dropped by stealth bombers over Kosovo in 1999 and then during combat in the post-9/11 wars will soon be used by Ukrainian pilots flying Russian-made jets to kill Russian soldiers.

The weapon, called the Joint Direct Attack Munition, consists of a kit that turns a cheap unguided bomb into a highly accurate, GPS-guided weapon. It is usually referred to as JDAM (pronounced JAY-dam).

The Biden administration announced this week that the weapons would be part of a new $1.85 billion military aid package, giving Kyiv a precision-guided bombing capability it has never had.

When dropped from higher altitudes, the bomb can travel about 15 miles to its target before exploding.

With the right kind of equipment, Ukrainian jets could potentially carry multiple JDAMs on a single mission, just like U.S. and NATO warplanes do.

Technically speaking, JDAM refers to a kit that is bolted onto the U.S. military’s general purpose Mark-80-series bomb and turns it into a GPS-guided weapon.

The Mark-80 warhead, which was developed soon after World War II, was designed to be easily fitted with a variety of tail fins and fuzes for use in a range of situations. Over decades, different attachments have been fielded — for low-level bombing, and to turn them into land and sea mines, and finally into various types of guided weapons.

It typically comes in three sizes ranging from 500 to 2,000 pounds. However, which model or models will be provided to Ukraine is unclear.

Since their first combat use in the late 1990s, JDAMs have been improved and new capabilities have been added. They can work with a variety of fuzes that control whether they explode above the ground, on the surface or after burrowing into the ground. One updated kit adds a pair of wings that open after the bomb is dropped, allowing it to fly more than 40 miles to a target.

They are also relatively inexpensive, in the Pentagon’s math. A Navy fact sheet updated in 2021 put the basic JDAM kit’s average price at just over $24,000 apiece.

JDAM was born out of the frustration that pilots and Air Force leaders had with a different kind of guided bomb during Operation Desert Storm in 1991.

First used in small numbers toward the end of the Vietnam War, that bomb was called the Paveway II. At the time, the idea was considered revolutionary: An expensive kit fixed to the nose and tail of a Mark-80 could make the otherwise unguided bomb maneuverable along the path of a laser shone from the ground or from a plane above. But in Iraq, sandstorms and smoke often disrupted the path of the laser beams, causing the bomb to miss its target.

Months after that war ended, the Air Force decided that military pilots needed a kit that would not cost more than Paveway II and could guide bombs in all weather conditions. A new constellation of GPS satellites offered a solution, continuously beaming radio signals that could guide bombs night and day, rain or shine.

Air Force leaders accelerated work on a similar device to produce what ultimately became JDAMs, which are now made by Boeing at a factory in St. Charles, Mo.

Unlike some U.S.-provided weapons, the issue is not the length of training or the cost of maintenance. A few fundamental hardware and software problems had to be solved: JDAM kits were not designed to be used with Ukraine’s Russian-made bombs, and the country’s Russian warplanes cannot carry American-made bombs, nor can Russian flight computers communicate electronically with American guided munitions.

Since Poland, a former satellite of the Soviet Union, joined the North Atlantic Treaty Organization, some of its Russian MIG-29 warplanes have been converted to carry Western munitions, but that required replacing their Soviet-designed computer systems and some wiring with Western-made gear. A faster approach was needed for Ukraine.

At Ramstein Air Base in Germany, a U.S. Air Force and Air National Guard team called Grey Wolf provides support to the Ukrainian Air Force, including on tactics and techniques, a military spokesman said.

Yes, quite a bit.

Carrying the bomb securely is one thing, but there are other problems. The electrical signal generated when a pilot presses the button to drop that bomb has to be converted to one that American-made devices recognize. And before being dropped, a JDAM needs data on the aircraft’s position and velocity as well as the target’s location fed into it electronically while the plane is in flight.

Newer types of American bomb racks and pylons offer solutions. One “smart” pylon used with the HARM missile is now in service with Ukraine’s air force.

The final piece is to transfer data from the cockpit to the pylon once all other conversions and adapters have been figured out, said Mike Pietrucha, a retired Air Force colonel who spent decades flying as a weapons officer on F-4G and F-15E fighters.

More than a decade ago, he said, the U.S. military developed a system to adapt an American-made GPS-aided weapon on a foreign aircraft using a laptop with a GPS device that connected to the smart pylon via Bluetooth.

“Today, the same function could probably be accomplished using a tablet with a GPS attachment, and perhaps commercial flight software,” he added. “From there, the pylon would transfer the data to the bomb itself.”

Boeing says on its website that it has made more than 500,000 JDAM kits for the United States and allied countries.

How many are headed to Kyiv has not been made public, though it is likely that 500-pound JDAMs will be provided to start with. It marks a significant increase in Ukraine’s precision-guided munition capabilities.

“It’s very important,” said Andriy Zagorodnyuk, a former Ukrainian defense minister who advises the government.

Eric Schmitt contributed reporting.

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