GI glasses

GI glasses are prescription glasses from the United Sates military. They are given to soldiers and sailors, especially during basic training (boot camp). GI glasses have been officially known as Regulation Prescription Glasses (RPG) or similar names. A nickname for GI glasses is Birth control glasses. Contact lenses are never permitted during basic training.

GI glasses, gray cellulose acetate, 1960s design
Army issue glasses from the mid 1980s.
Male S9 ("MS9") GI glasses, 1990s design.
Female S9 ("FS9") GI glasses.
Model "5A" GI glasses, 2012 design.

Similar glasses without any metal may be issued to inmates at state and federal prisons.