Mack Defense Awarded Major Contract By U.S. Army To Produce Heavy Dump Trucks

The Mack Defense mascot standing on top of a heavy dump truck. Image: Capt. Joe Legros, U.S. Department of Defense

Mack Defense press release

Mack Defense has been awarded a new five-year contract to continue production of the U.S. Army’s M917A3 Heavy Dump Truck (HDT) for up to 450 trucks with a total contract value up to $221.8 million. This new agreement follows the successful fulfillment of the initial contract awarded in 2018 and comes after the company recently celebrated the production of its 500th M917A3 HDT in March 2025.

“This contract represents continued confidence in our ability to deliver mission-critical vehicles to the U.S. Army,” said David Hartzell, president of Mack Defense. “The M917A3 Heavy Dump Truck is a commercial-based truck modified to meet mission-critical functionality that directly supports the Army, Army Reserve and Army National Guard operations within the United States and around the world. This new contract award is a testament to the commitment of our team, which includes our supplier partners, as well as to the robust capabilities of this heavy tactical vehicle platform. We look forward to building and delivering more reliable, high-performance trucks that meet the demanding needs of our soldiers.”

The new contract, awarded June 24, 2025, will ensure continued production of the critically important M917A3 HDTs that support the U.S. military’s construction and infrastructure maintenance capabilities. These vehicles play a vital role in supporting construction and upkeep of airfields, roadways, landing strips, supply facilities, motor pools and in disaster relief for areas affected by severe weather.

Based on the commercially available Mack® Granite® model, the M917A3 HDTs are manufactured at Mack Defense’s dedicated production line at the Mack Experience Center (MEC) in Allentown, Pennsylvania. The specialized production facility has been in operation since 2021 following a $6.5 million investment to create a dedicated HDT production line, which leverages the capabilities and production work force of Mack’s main Lehigh Valley production operations located in Macungie, Pennsylvania.

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