G&P US Army Wind Dust Airsoft 2mm PC Glass Goggle GP275
[AS550]

This was also bought to go along with a Nam loadout - the basic and simple look to it makes it feel older. It fits well on my head and is quite comfy too. The only problem I had was it steaming up, and that can be a big problem, removing some tape covering some of the air holes helped. I might need to make some modififactions though to allow more air through, a drill will do the trick!