Read the excerpt from "How the Internet and Other Technologies Came About."

Tanks and submarines were easily simulated, since looking through goggles wasn’t very much different from looking through a pair of binoculars or a periscope. Since the first head-mounted display was built for the Pentagon in 1968, primitive versions of virtual reality have since proliferated to video arcades around the country.

Which information from the excerpt best supports the inference that certain video games resulted from issues related to national security?