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  2. Vortex Optics - Wikipedia

    en.wikipedia.org/wiki/Vortex_Optics

    Vortex Optics is a DBA of Sheltered Wings, Inc., which was incorporated in Wisconsin in 1989. Sheltered Wings, Inc. DBA Vortex Optics began in 2002. In 2022 after extensive research, testing and reviews Vortex became an official supplier and contractor to the American Military as the U.S. Army selected Vortex‘s XM-157 fire control system for its Next Generation Squad Weapon program.

  3. Optical vortex - Wikipedia

    en.wikipedia.org/wiki/Optical_vortex

    An optical vortex (also known as a photonic quantum vortex, screw dislocation or phase singularity) is a zero of an optical field; a point of zero intensity. The term is also used to describe a beam of light that has such a zero in it. The study of these phenomena is known as singular optics.

  4. Lockheed Martin F-35 Lightning II procurement - Wikipedia

    en.wikipedia.org/wiki/Lockheed_Martin_F-35...

    The first operational USAF F-35 on its delivery flight to Eglin Air Force Base in July 2011. Lockheed Martin F-35 Lightning II procurement is the planned selection and purchase of the Lockheed Martin F-35 Lightning II, also known as the Joint Strike Fighter (JSF) by various countries.

  5. Nightforce Optics - Wikipedia

    en.wikipedia.org/wiki/Nightforce_Optics

    Nightforce Optics, Inc. is an American manufacturer of high-end telescopic sights, spotting scopes and mounting accessories, based in Lavonia, Georgia with factory headquarters in Orofino, Idaho. Established in 1992, the company is the optic subsidiary of Lightforce Performance Lighting , an Australian manufacturer of specialty lighting ...

  6. Blade-vortex interaction - Wikipedia

    en.wikipedia.org/wiki/Blade-vortex_interaction

    A blade vortex interaction (BVI) is an unsteady phenomenon of three-dimensional nature, which occurs when a rotor blade passes within a close proximity of the shed tip vortices from a previous blade.

  7. Bushnell Corporation - Wikipedia

    en.wikipedia.org/wiki/Bushnell_Corporation

    Bushnell introduced the AR Optics 1-4 scope in 2018. It has a 30mm tube and has an objective lens diameter of 24mm. It has caliber-specific reticles that are illuminated for use in low-light. The AR Optics 1-4 is intended for use with modern sporting rifles. [31]