Key Points and Summary – The U.S. Army has canceled the planned M1 Abrams SEPv4 (System Enhancement Package Version 4) upgrade, citing concerns that the tank has reached its weight and power limits and will not be dominant on the 2040 battlefield.
-An Army Science Board report concluded that successive upgrades have made the Abrams too heavy, impacting its mobility and survivability.
-Instead of the SEPv4, the Army will focus on developing a more revolutionary upgrade, the M1E3.
-This future variant will be lighter and is planned to incorporate a hybrid-electric drive, an unmanned turret, and other advanced technologies to address future threats.
Why Did The Army Cancel The M1 SEPv4 Abrams Tank?
The Army’s M1 Abrams System Enhancement Package Version 4 (SEPV4) is a proposed impressive modernization of the long-standing American main battle tank (MBT).
These upgrades offer numerous improvements over the previous SEP3 configuration.
However, the Army canceled the M1 Abrams SEPv4 upgrade due to concerns about its weight, mobility, and ability to dominate the battlefield in the future.
The Army decided to focus on a more radical modernization effort, the M1E3, which will incorporate lessons learned from the SEPv4 and address the evolving threats on future battlefields.
The Army Science Board Says The Abrams Days Are Numbered
The Army Science Board (ASB) published a report that cited several factors the Army considered. The ASB is concerned that the M1 Abrams SEPv4 will no longer be a dominant tank by 2040 and will therefore be inadequate in future warfare.
The report cited the M1’s declining advantages in mobility, firepower, and protection against evolving threats. The ASB recommended the development of fifth-generation armored vehicles. Meanwhile, the Army will continue to fund the M1 Abrams SEPv3 (System Enhancement Package Version 3) variant.
This tank features advanced technologies, including enhanced infrared detection and a more powerful 120mm cannon. It will also include some of the SEPv4’s features and have a modular design, which makes it easier to incorporate new technology into an older weapon system.
Once testing is complete, it will be named the M1A3 Abrams.
The Army has stated that the M1E3 Abrams will be the service’s first hybrid-electric combat vehicle.
The objective of this revolutionary change in basic armored vehicle propulsion technology will be to reduce the fuel consumption of the Army’s armored corps and extend the battlefield endurance of the entire M1 fleet.
Some Enhancements And Upgrades of the M1 Abrams SEPv3
-A weight reduction of approximately 10 tons of the current SEPv3.
-A hybrid-electric diesel engine that will produce some 50 per cent improved fuel efficiency.
-An unmanned turret similar to other contemporary new MBT designs seen in both Europe and Russia. This has the potential to reduce the crew size from four to three by incorporating an autoloader. The three crewmen will be seated in the hull.
-An advanced set of armor protection developments designed to defeat drone-deployed munitions.
-A command and control system that permits Integration with unmanned aerial vehicles (UAVs)
-An AI-powered threat detection and fire control system.
M1 Abrams SEPv4 Tank: The Army Science Board Minced No Words
The Army Science Board, a sanctioned independent group of experts that advises the Secretary of the Army, was candid in its report. The ASB explained in detail why the planned SEPv4 variant is inadequate for future warfare.
The study, which took several years to complete, concluded that the Abrams tank would not be usable in operations after 2040 and recommended developing additional fifth-generation armored vehicles.
“Based on our findings, the M1 Abrams will not dominate the 2040 battlefield. All of the M1’s advantages in mobility, firepower, and protection are at risk.
“The M1A2 SEP V3&4 upgrades will improve effectiveness but will not restore dominance. Near transparency in all domains will significantly increase the lethality our forces will experience. China and Russia have studied our forces and doctrine and are fielding countermeasures.”
The ASB report added, “We will continue to be outnumbered, which is exacerbated by a low MBT operational readiness rate and an aging fleet.”
“The Abrams Tank can no longer grow its capabilities without adding weight, and we need to reduce its logistical footprint,” said Major General Glenn Dean, Program Executive Officer for Ground Combat Systems.
“The war in Ukraine has highlighted a critical need for integrated protections for Soldiers, built from within instead of adding on.”
The Newer Abrams Tanks Are Too Heavy
The SEPv3, with all of the platform’s added components, increased the tank’s weight from 76 to 78 tons; the SEPv4 weighs even more, about 80 tons. There are just too many add-ons to make it feasible.
This increased weight will have a serious negative impact on the tank’s mobility, as well as its survivability, both of which were central considerations in the Army’s cancellation decision.
By comparison, the M1A1 Abrams that the United States sold to Ukraine weighed 63 tons. Those tanks are already too heavy for most of the bridges in Ukraine.
General Dynamics, which has built Abrams tanks for more than 40 years, is working on another tank in the Abrams family called the “Abrams X.” Currently, however, there are no plans to produce it.
Still, some of the tank’s designs could eventually reach the M1 Abrams SEPv3/M1A3. This model is less armored, more mobile, and weighs 59 tons.
The Army is struggling to transport its troops to a modern war in the Indo-Pacific region. The Abrams was already a heavy tank, but the 80-ton SEPv4 is too heavy. The upgrades and additional protection systems require more weight to be bolted on the side of the hull or turret.
And as we know, logistics win wars.
The Army is considering the development of a 5th-generation tank; until then, the M1 Abrams SEPv3 will suffice. At least for now, it is still one of the best tanks in the world.
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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