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GI glasses are eyeglasses issued by the American military to its service members. Dysphemisms for them include the most common " birth control glasses " ( BCGs ) and other variants. At one time, they were officially designated as regulation prescription glasses ( RPGs ).
Some styles can accommodate prescription lenses. Several types of goggles are available because they are optimized for certain purposes, such as regular use, use in vehicles, or use with night vision goggles. Some fit over regular eyeglasses, some can accommodate prescription lenses, and others are designed for those who do not wear eyeglasses. [4]
Ballistic sunglasses or prescription eyeglasses must meet the same requirements. In brief, the U.S. military standard requires that ballistic eyewear must be able to withstand up to a 3.8 mm (.15 caliber) projectile at 195 m/s (640 ft/s)) for spectacles and 5.6 mm (.22 caliber) projectile at 168–171 m/s (550–560 ft/s) for goggles.
A prescription of −1.00 +0.25 × 180 describes a lens that has a horizontal power of −1.00 D and a vertical power of −0.75 D. Only ophthalmologists write prescriptions in + cylinder. An optometrist would write a prescription in - (minus) cylinder. All spectacle and contact lenses would be made in minus cylinder.
Subtitle B—Army; Subtitle C—Navy and Marine Corps; Subtitle D—Air Force and Space Force [2] Subtitle E—Reserve Components; Subtitle F—Alternative Military Personnel Systems; The current Title 10 was the result of an overhaul and renumbering of the former Title 10 and Title 34 into one title by an act of Congress on August 10, 1956.
United States Army Lt. Gen. John Kimmons with a copy of the Army Field Manual, FM 2-22.3, Human Intelligence Collector Operations, in 2006 FM-34-45. United States Army Field Manuals are published by the United States Army's Army Publishing Directorate. They contain detailed information and how-tos for procedures important to soldiers serving in ...