The 221st Mechanized Assault Group represented a battle group within the structure of the Galactic Empire. This particular unit employed century tanks painted in a light blue scheme, enhanced with improved defensive capabilities and customized blaster weaponry.
In the Ground Assault expansion for the Star Wars PocketModel TCG, which launched in 2007, a miniature depicting a 221st Mechanized century tank was included, identified as a "TIE Crawler"—an alternative designation for the century tank. The miniature's base indicated an attack value of zero, signifying the absence of any enhancements to improve its targeting accuracy. Conversely, its defensive statistics surpassed those of comparable units.