night vision

And night-vision photography would never have been deemed sexy.

Dusk is the time of least visibility to the eye and to night-vision sniper goggles, they said.

The U.S. government has also provided Humvees and night-vision goggles as well as arms and ammunition to the Yemeni military.

The administration has provided Yemeni special-ops with gear ranging from Humvees and night-vision goggles to arms and ammunition.