Night-vision goggles

Night-vision goggles are a piece of unused headwear in Fallout 3, Fallout: New Vegas and Fallout Tactics and were to appear in Van Buren and Fallout: Brotherhood of Steel 2.

Fallout 3
Meshes and an inventory icon for night-vision goggles appear in the Fallout 3 resource files but are unused.

Fallout: New Vegas
The graphical assets from Fallout 3 for the night vision goggles do not remain in the Fallout: New Vegas art files (except the inventory icon).

Fallout Tactics
Night-vision goggles were set to appear in Fallout Tactics, but are unused.

Van Buren
General Colridge, Captain Davidson, Captain Pierce and Major Briggs all carry night-vision goggles.

Fallout: Brotherhood of Steel 2
Wearing night-vision goggles creates a green filter over the screen and enemies will glow allowing the user to see them after sundown or in poorly lit areas.