The Light of God is a constructed image of a laser targeting system, based on a description given in Omer Fast's film Five Thousand Feet is the Best (2011, excerpt):
We call it in, and we're given all the clearances that are necessary, all the approvals and everything else, and then we do something called the Light of God - the Marines like to call it the Light of God. It's a laser targetting marker. We just send out a beam of laser and when the troops put on their night vision goggles they'll just see this light that looks like it's coming from heaven. Right on the spot, coming out of nowhere, from the sky. It's quite beautiful.