Which of the following is not one of the eight variables of the operational environment?

The correct answer, which is the variable that is not included among the eight variables of the operational environment, is the technical variable. The eight variables typically include political, military, economic, social, information, infrastructure, physical environment, and time.

The technical aspect is often encompassed within other variables, especially the military and information dimensions, as technological capabilities are considered part of the military aspects and the information environment. Therefore, while technical factors are critically important in military operations and can influence other variables, they are not specifically identified as a standalone variable in the context of the operational environment.