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.
I was looking at the Force 10 AC Cargo Pants when I was at their store last month, but they were all out of my size. They said a bunch of GoRuck guys came in and cleaned them out a week before I showed up. haha
Anyway, the patches are pretty cool, I don’t know about “glow for hours”, but I know that they are useful in the dark. I had one on the nape of my neck during a night hike. My buddy said that it was the only way he could find me sometimes. That being said, it was REALLY faint and he had to be within five feet or so to see it.