Summary and Key Points: Steve Balestrieri examines Britain’s Challenger 3, the Rheinmetall BAE Systems Land conversion of 148 Challenger 2 hulls under a $1 billion 2021 contract, with a new turret, the Rheinmetall 120mm L55A1 smoothbore firing single-piece DM63 and DM73 rounds.
Challenge 3 Is Military History in the Making
The British Army has a front-row seat to the bloodiest armored war in Europe since 1945.
It’s taking notes, and despite the plethora of drones and anti-armor weapons on the Ukrainian battlefield, the Brits are constantly looking for ways to upgrade their newest main battle tank (MBT) to survive a modern conflict.
According to Business Insider, a UK Ministry of Defense spokesperson said Britain is “taking a load of data from Ukraine” and integrating it straight into the development of the Challenger 3 main battle tank.
The spokesperson said the tank’s new features are modular, so they can be swapped in and out, and that Britain has options for drone-related defensive equipment and protection packages that can be bolted on as needed.
That’s the correct approach.
The war in Ukraine has rewritten the survival manual for armor, and the Brits would be foolish to field a new tank without taking into account the lessons learned in that bloody meatgrinder.
A New Tank Built On An Old Hull
The Challenger 3 isn’t a new platform design. Rheinmetall BAE Systems Land keeps the Challenger 2 hull but adds a completely new turret, armament, sensors, protection, and digital architecture.
In 2021, the UK awarded the joint venture a roughly $1 billion contract to convert about 150 Challenger 2s. Business Insider reports there are seven prototypes, with an eighth in production.
The biggest change is the gun.
The Brits are finally ditching the rifled L30 for the Rheinmetall 120mm L55A1 smoothbore, the same gun on the Leopard 2.
That means the tank fires single-piece NATO-standard ammunition, including Rheinmetall’s DM63 and DM73 rounds, instead of the two-piece rounds the Challenger 2 used.
For a NATO army that may have to share ammo dumps with allies in a potential war with Russia, that alone is worth the price.
For protection, the tank gets new modular armor and the Israeli-made Trophy active protection system, which uses radar to detect incoming missiles and fires its own intercepting munitions.
The Army first showed the tank to the public at Tankfest in June.
The Brits Are Using Hard-Fought Lessons Learned In Ukraine
Britain didn’t need to guess how its tanks would fare.
It sent 14 Challenger 2s to Ukraine in 2023, and all of them went to the elite 82nd Air Assault Brigade.
Ukrainian crews loved the gun, with one operator calling the tank “a sniper rifle among tanks.”
However, the first was lost during the 2023 counteroffensive near Robotyne, and London later confirmed Russian artillery had hit it.
At least two have now been lost in combat. According to Forces News, the 82nd began using them as mobile artillery, exploiting their accurate main guns while keeping them out of harm’s way. The tanks also struggled to move through Ukraine’s mud.
That is the reality of the war in Ukraine.
A Western main battle tank, designed to slug it out with enemy armor, ended up providing long-range fire support because the battlefield had become too lethal for anything covered in metal.
That is the lesson the Challenger 3 has to answer.
The Data Pipeline Is Real
The Brits now have formal access to much more than tank crew feedback.
In September, Britain became the first international partner to access Ukraine’s battlefield data, collected over more than four years of war, in exchange for British research, computing capacity, and missile technology.
That includes drone footage, jamming data, and the operation of autonomous systems. “This world-first access to real battlefield data will allow British companies to continue pushing the frontier of defense innovation, deterring our enemies and making us safer at home as well as further strengthening Ukraine,” British defense minister Wes Streeting said in a statement.
Kyiv knows exactly what it has. Ukrainian officials have described that data as priceless and a bargaining chip with allies, as Business Insider has also reported.
For tank designers, millions of hours of first-person footage of drones hunting armor is an intelligence goldmine.
The 20-40-40 Model
Business Insider notes the Challenger 3 sits at the center of the British Army’s “20-40-40” model.
Under the 2025 Strategic Defense Review, 20 percent of capability goes to heavy platforms like the Challenger 3, 40 percent to single-use munitions such as one-way attack drones and artillery shells, and 40 percent to reusable strike and surveillance drones.
The drones go in first.
The tanks arrive after.
It is arguably the smartest thing about this program.
The Army isn’t pretending the tank is dead, and it isn’t pretending the tank can fight alone.
Cheap drones and robots absorb the risk so the expensive, crewed platforms don’t have to.
The Weak Spots
However, many porous areas remain
First, Trophy was built to stop anti-tank guided missiles and RPGs.
The FPV drones that have savaged armor in Ukraine attack from the top and the rear, often slowly and in numbers.
That’s a different problem, and it’s why those modular drone-defense options matter so much.
If they aren’t installed when the shooting starts, they won’t help.
Second, officers told Business Insider that the Challenger 3 of today isn’t finished.
That’s honest, and it’s the right mindset.
It also means the Army is fielding a tank whose final shape depends on a war still being fought.
Third, numbers.
The program of record calls for just 148 tanks.
The Brits will have a similar number of Challenger 2s that won’t be upgraded.
No determination has been made on what to do with them.
Ukraine has shown how fast a battlefield eats armor.
A small fleet of excellent tanks is still a small fleet, and you can’t put the same tank in two places.
Say what you will about whether the tank has a future on 21st-century battlefields.
That debate is beside the point for the British Army.
It has decided armor still matters, and it’s building the Challenger 3 on lessons Ukrainian crews paid for in blood.
The Brits are taking a load of data from Ukraine.
The real test is whether they act on it all before they need it. And how they plan to field a force that consists of only 148 tanks, the size of an armored brigade.
About the Author: Steve Balestrieri
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.
