A “Ranger Eye” is a specific type of patch used for identification purposes. The following description of a Ranger Eye patch is from the Triple Aught Design website.
Traditionally, Ranger Eyes are used to help identify friend from foe during night missions and to make it easier to follow members of your unit under the cover of night. Throw these on the back hood of your Ranger LT, Stealth LT, FAST Pack, or any of our gear with loop. Expose Ranger Eyes to light for ten or so minutes, depending on the intensity, and these will glow for hours.
The Triple Aught Design Logo Ranger Eye patch I have came with the purchase of their Force 10 AC Cargo Pants. There’s a small hook and loop area around the knee of the pants where this patch can live securely.
In addition to this patch Triple Aught Design sells a number of other Ranger Eye patches and hopefully I’ll remember to pick up one or two in the next order I place with them.