The M939 series is a family of military trucks designed for the United States Army. Introduced in the 1980s, these vehicles are known for their durability and versatility, capable of transporting troops and equipment in various terrains. The series includes several models, such as the M923 and M925, which differ in payload capacity and configuration. These trucks are built on a 5-ton chassis and feature a 6x6 wheel drive system, enhancing their off-road capabilities. The M939 series is often used for logistical support, including cargo transport and towing artillery, making it an essential asset for military operations.