Which of the following is NOT a variant of the JLTV?

The Combat Support Vehicle is not recognized as an official variant of the Joint Light Tactical Vehicle (JLTV) program. The JLTV consists of several established configurations designed to meet specific tactical needs, and those include General Purpose, Heavy Gun Carrier, and Utility variants. Each of these variants is tailored for distinct roles and capabilities, such as transporting personnel, carrying weapons systems, or providing utility support. However, 'Combat Support Vehicle' does not represent an official designation within the JLTV variants, making it the correct answer in this case. Understanding the designated variants is crucial for grasping the operational flexibility and tactical applications of the JLTV within military operations.