Why were US men called g i joe?

U.S. men were called "G.I. Joe" as a term that originated during World War II, referring to "Government Issue" or "General Issue," which was often used to describe soldiers and their equipment. The name became popularized through a 1964 toy line produced by Hasbro, which featured Action Figures modeled after American soldiers. The term symbolizes the average American soldier and has since become iconic in American culture, representing military personnel in general.