The M577 is a US tracked armored command post vehicle. It is based on an M113 armored personnel carrier chassis and is a member of the same vehicle family. Despite its bulky appearance this vehicle is fully-amphibious. On water it is propelled by its tracks. The M577 is basically an M113 with a raised rear part of the roofline. This vehicle is used as a tactical operations center. Hull of this armored vehicle is welded of aluminum armor. Up to 40% of vehicle components are manufactured from light alloys. It allowed to save weight. Armor of this vehicle provides protection against small arms fire and artillery shell splinters. Vehicle is also fitted with NBC protection system. Vehicle has a crew of 5, including the driver. Crew enter and leave the vehicle via rear power-operated ramp with integral door. There is a commander’s hatch. The M577 has a tent extension. It is attached at the rear, when vehicle is stationary. It provides additional work space for command staff. Furthermore multiple M577 command vehicles can be connected via the tents. The M577 is also fitted with external diesel generator. It is mounted at the front of the vehicle and develops 4.2 kW to provide 24 volt power. The generator powers all electronic systems and communication equipment when the main engine is turned off. This vehicle does not carry any defensive weapons.