M3 Assault Drone

Design
The M3 Amphibious Assault Drone is a robotic land and aquatic vehicle designed to move as fast over land and under the sea as possible. It is designed to provide anti-explosive projectile (fuel rod rounds, grenades, rockets, etc.) cover for friendlies and to provide heavy anti-infantry and anti-vehicle support.

The M2 is equipped with anti-gravity pods powered by the on-board hydrogen that it uses to hover above the ground. Propulsion jets are used to propel the drone rapidly around.

Like the M1, the M3 is constructed of a variable-density material that allows the drone to sink or float.

Armament
The M3 is armed with four automated turrets providing overlapping fields of fire with a maximum range of 700 m.

There is also a 90 mm Cannon mounted on the top of the drone that can spin around 360o.

Power
There are three series of M3 drones, each one with a different power source.

Hydrogen Engine
The standard M3 Amphibious Support Drone is equipped with a hydrogen engine, providing cheap, efficient energy for a long duration.

Remote Power
M3(R) drones on planets held and fortified by the UNSC are equipped with wireless power modules, enabling the fusion reactors in the bases to power the drone remotely, thus reducing weight and increasing its speed.

Fusion Reactor
An experimental line of M3's equipped with fusion reactors were field tested. They proved to be lighter and more efficient than the other two methods but were too expensive for mass production.