According to Tactical Night Vision Company's product info: The AN/PVS-21 uses a patented “folded optics” system that projects the night vision image into a pair of see-through optics.

Night vision relies on image intensification, which gathers incoming low-level light, ... [Defense One – DID – L3 – Soldier Systems – TNVC] lead image: USAF. Night vision.

Anyone recognize the night vision optics that the keffiyeh-donning operator at the center of this photo is wearing? They look to me like Tactical Night Vision Company's AN/PVS-21 Low Profile Night ...