In Combat With HMMWVs
by David Doyle The original High-Mobility Multipurpose Wheeled Vehicles (HMMWV) was the M998. In 1991, the M1097 was developed to fill the need for a vehicle with a higher payload…
by David Doyle
The original High-Mobility Multipurpose Wheeled Vehicles (HMMWV) was the M998. In 1991, the M1097 was developed to fill the need for a vehicle with a higher payload and towed-load rating than was provided by the earlier models. This heavy Humvee has a reinforced frame, heavier springs, tires and rims and other improvements. It is powered by a 190 horsepower turbo supercharged version of the diesel engine, and like the rest of the HMMWV family, the M1097 features full time four-wheel drive and automatic transmission.
Broadened demands placed on the chassis type resulted in a series of increases in the vehicles’ gross vehicle weight rating, along with associated improvements in the drive train. These changes culminated with the expanded capacity variant (ECV), sometimes also known as the Expanded Capacity Humvee (ECH) was developed.
The ECH vehicles added a turbosupercharger to the 6.5 liter V-8 diesel engine, improved differentials, brakes, cooling system, and has a beefier frame. The ECH vehicles include the M1113 base vehicle, M1151 armament carrier, M1152 cargo and troop carrier.
As of 2006, the M1113 became the base vehicle for future HMMWV orders, with the bulk of these consisting of M1151 and M1152 variants.

David Doyle's earliest published works were occasional articles in enthusiast publications aimed at the historic military vehicle restoration hobby. This was a natural outlet for a guy whose collection includes several Vietnam-era vehicles such as M62, M123A1C, M35A2, M36A2C, M292A2, M756, and an M764.
By 1999, his writing efforts grew to include regular features in leading periodicals devoted to the hobby both domestically and internationally, appearing regularly in US, English and Polish publications.
In 2003, David received his a commission to write his first book, The Standard Catalog of U.S. Military Vehicles. Since then, several outlets have published more than 100 of his works. While most of these concern historic military hardware, including aircraft and warships, his volumes on military vehicles, meticulously researched by David and his wife Denise, remain the genre for which he is most recognized. This recognition earned life-time achievement in June 2015, when he was presented Military Vehicle Preservation Association (MVPA) bestowed on him the coveted Bart Vanderveen Award in recognition of “...the individual who has contributed the most to the historic preservation of military vehicles worldwide.”
In addition to all of publishing efforts, David is the editor of the MVPA’s magazine, History in Motion, as well as serving as the organization’s Publications Director. He also maintains a retail outlet for his books online and at shows around the U.S.