It's a logo for night vision and is of a night vision lens. The lens is facing the viewer and is an monocular, having only one lens. There is the base of the lens behind that.
This page contains the Night Vision vector icon, as well as variations of this icon in different visual styles, and related icons. All icons are in the flat vector style, however, differ by the line thickness, fill, and corner radius.
Idea of Night Vision Icon by Earl Moore
We've received the idea on August 22, 2012 and created the icons on September 5, 2012
Military Equipment - (Army) Boots, Rucksack, Webbing (Assault Rig), Helmet (If you can the British Kevlar type too. Part of the facial icon or not), Nightvision, Camo cream/paint, Ration Pack, medal, Tent or makeshift shelter, rifle, grenade