This is the MK25 variant of Oshkosh MTVR cargo truck.
Introduced in 2005, the Oshkosh MK25 Medium Tactical Vehicle Replacement or MTVR is a rugged cargo truck that serves as the US Army's workhorse.
It is powered by a 425 horsepower Caterpillar C12 12L turbo diesel inline 6 engine, which transfers its power through an Allison 7 speed automatic transmission to all 6 wheels.
The vehicle sits on 6 53" Michelin ZXL offroad tires paired with Oshkosh's TAK-4 independent suspension.
This particular model is fitted to be a troop carrier with an armored cabin, a roof rack, a bumper mounted tow bar, an M60 machine gun, and an armor protection kit with a deployable step ladder.
The truck features functional doors, hatch, ladder, hood, gun turret, and tow hitch.

CONTROLS:

PITCH to drive.
ROLL to steer.
Act 1 and 2 toggle turn signals.
Act 3 activates a gyroscope to right the vehicle if it flips.
Act 4 opens driver side door.
Act 5 opens passenger side door.
Act 6 opens the hatch and activates the gun turret, use YAW to aim the gun.
Act 7 opens the hood.
Act 8 toggles running lights.
LandingGear deploys the rear ladder.
TRIM opens the rear tow hitch.
MK23 version
MK31 Semi version with M970 fuel trailer
Small water trailer