Medium Tactical Vehicle Replacement (MTVR) is a six-wheel drive all-terrain vehicle used by the USMC and US Navy.

It is designed to replace the old M939 tactical trucks, and was first fielded in 1998, after the contract was awarded to Oshkosh Truck Corporation. The MTVR comes in several variants, for a wide spectrum of tasks. It offers a major improvement in off-road capability.

The MTVR Armor System (MAS) was designed for the 7-ton MTVR. The kit provided complete 360-degree protection, as well as overhead and underbody protection for the crew compartment utilizing Mil-A-46100 High Hard Steel and Metal Composite. Options for the kit included a personnel carrier configuration. The MAS came in two versions. These were a standard configuration and a Reducible MAS that was designed to meet the height restrictions when deployment aboard naval ships and when installed allowed the vehicle to be reducible to 98 inches. The armor kit weighted 10,500 pounds for both the cargo and personnel configurations.