Parallax is the apparent shift of an object. It is designed to be parallax-free at distances exceeding fifty meters. This increases the Paratrooper’s depth of field and perception of cues in their sector. It is designed to be fired with both eyes open. The M68 is from a family of sights known as reflex- or red-dot sights. There are three versions of the CCO available in the force. No centering or focusing on the front sight post is required. ![]() The red dot aiming point follows the horizontal and vertical movement of the firer’s eye, allowing the firer to remain fixed on the target. The CCO provides a red-dot aiming point using a 2 or 4 Minute Of Angle (MOA) diameter reticle, depending on the variant. It is the sighting system for the M4/M16 family of weapons with the highest population across the United States Army. It provides Soldiers the ability to fire with one or two eyes open, as needed for the engagement sequence in the shot process. The close combat optic (CCO), M68 is a non-telescopic (unmagnified) reflex sight that is designed for the “eyes-open” method of sighting. The reference for this is TM 9-1240-413-13P dated may 2013, and TC 3-22.9, Change 1 dated January 2017 ![]() Specifically, we will be discussing the M68 Close Combat Optic, or CCO. For Tactics, Techniques and Procedures Thursday, we are continuing our discussion on optics.
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