The CATTB (Component Advanced Technology Test Bed) was an experimental American main battle tank developed in the late 1980s. Built on a modified M1 Abrams chassis, it served as a testbed for future armored technologies. Its defining feature was a massive 140mmXM291 smoothbore gun equipped with an autoloader, paired with an advanced hydropneumatic suspension and an upgraded engine system.

This big boi has big 140mm cannon with over 520mm pen giving you advantage over default t12 cannons. However, it has slow reload thanks to his big caliber. This turret also has a lot of vulnerable zones on the front unlike SEP v3. It also has radars and LWS that can help you to detect enemies.