In Call of Duty 4, what is the use of the glint tape? (Jon - Pittsfield, MA)?

Question

To connect accessories to a weapon

To give the player directions when lost

To identify a friendly soldier in the dark

To designate a target for support fire

Answer 1

To identify a friendly soldier in the dark, its around the arm of your friendlies, or on their helmets (getting conflicting evidence, in a video it kinda looks like its on top of the shoulders) , activated when you turn night vision on.