Formations is a highly respected aftermarket company run by Rob Ervin in Bolivar, Tennessee. Most of his product line is devoted to upgrading Sherman kits, both in U.S. and British service, from various manufacturers. Longtime modeler Ervin began Formations in 2003, inspired by the success of Joe Bacanovic at Tiger Model Designs and to fill the void left when Sid Arnold closed down his Armored Brigade Models. He has carved out a distinctive niche among the "cottage industrialists" and enjoys a reputation for thorough research and an amiable personality. The company has more than 75 products, including updates for the M3A1 and M5A1 Stuarts.