As part of the ISP’s defensive measures, major cities are fortified with multiple layers of defenses. One such layer is static artillery in the form of the M55. A multipurpose weapon system, the M55 is used against both conventional ground units, and as anti-starship defense.
The M55 is a railgun, firing 240 mm depleted uranium rounds. The system is deployed via dropship, but is otherwise static, resting on three hydraulic shock-absorbing support legs. The slugs are self-guided smart rounds, with fins that extend from the rear after launch to direct the round. Using the locations of the shell, the cannon, and the target, a path is projected for the shell that adapts to any movements the target makes.
With a range of 65 kilometers, the M55 can knock out transports as they land within its firing envelope, or destroy their offloaded forces as they approach if they land outside their range. An effective defensive emplacement, the M55 acts as a deterent to all who would try to invade ISP worlds.