Credit to PhantomBladeCorp for the T-55M model. (1) activates turret. (2) activates commander's position. (4) fires the 105mm M68. VTOL and Trim to control tank. Pitch and roll to control weapon position. Throttle to open hatch. The T-55P is a fictional variant of the T-55 main battle tank employed by the Paternian Army.

Several hundred T-55A main battle tanks were captured by the Paternian Army during the SNAS conflict. These machines, known locally as the M55 and internationally as the T-55P, would receive some modifications. Modifications include smoke dischargers, active protection systems, revised controls, a new commander's hatch, 105mm M68 cannon, and in some cases, armor upgrades.

As the Paternian Army already had large numbers of M6 main battle tanks, the T-55s were employed in secondary roles such as training vehicles. Some did see combat during the 1955 Southern Uprising and 1961 Operation Windlass, issued to the armored battalions of expeditionary divisions to replace the light tanks previously used.

Reception of the tank was mixed. Trainees felt the tank was rather cramped and found it difficult to operate in it quickly. In addition, it had a rough suspension, reducing ride quality and increasing wear upon the crew. These complaints, while acknowledged, were not acted upon since they were only for training purposes, and when they were out of training, they would no longer have to deal with said issues.

However, crews in light tank battalions were far more receptive. Generally smaller than the average tanker, they found the T-55 reasonably comfortable. In addition, while less mobile, it had far superior armor compared to the Walker Bulldog. Damage that would catastrophically destroy a Walker Bulldog would simply render the T-55 immobile. In addition, its 105mm gun was more accurate, more powerful, and longer-ranged than the 76mm or 90mm guns of the light tanks.