An Acorn Archimedes computer.
"The radio operator shouted for the archie to fall silent before they could pinpoint their location again."
Anti-aircraft artillery.
Alternative form of Archie (“anti-aircraft artillery”)
A diminutive of the male given name Archibald, from the Germanic languages, also used as a formal given name.
"My uncle Archie was born with that name because his grandfather wanted something traditional for him."