After the downfall of nations, most major corporations have some sort of private military detail under their command to defend their installations, personnel and subsidiaries. However, the corporate militaries, radically fine-tuned to fight low-intensity, urban fourth generation warfare, are an extremely expensive enterprise.
Thus, much of the equipment of defunct national militaries is used and modified to fit the new nature of warfare to fit R&D costs. While not as effective as specifically designed machines, the upgrades to old equipment are cheaper. Consolidated Defense And Resources, an American industrial supercorporation originating in California that controls most of the former US tri-state area and the rust belt, has upgraded the old M1A2 Abrams tanks of the army of its former nation to adapt to this new form of warfare and form the backbone of its relatively small tank force.
*Stripping most of the armor and lightening of the chassis. The tank is now largely armored by titanium plating ceramic composite blocks and NERA, after having its depleted uranium strike plates removed.
*Replacement of the Honeywell ATG gas turbine with two twin air-cooled three-phase 1210hp electric engines driven by large banks of lithium batteries arranged throughout the tank.
*Upgrading of the turret to be unmanned as well as to include an autoloader for the new 110mm smoothbore ETC gun. Now all crewmembers sit side-by-side in the frontal chassis section.
*Radical upgrading of the tank's C4ISR capabilities to include live-update battlefield networking with units from all branches as well as allied armies.
*Addition of Boomerang and BOSS surveillance systems.
* Replacement of the M2HB with an M312, integration of a CROWS mount.
*Addition of active infrared camouflage.