Answer:
A holographic sight is an attachment used by the united states army, special forces and is also sold to the general public for various types of weapons that the defence force or civilian population may poses. Essentially the red croshair is projected onto a small screen in the middle of the holographic sight, which is placed on the top of the weapon. this system is becoming increasingly common in the US army. The holographic sight has made a major appearance in the game Modern Warfare 2 were many factions of the world are depicted to own holographic sights, the holographic sight is also a customizable attachment for most guns in multiplayer.