ESS Profile NVG Goggles

Even in the same color, they still have difference in detail by year of manufacture. They take parts in APEL. Stock Number Reference:

ESS Profile NVG Unit Issue

Frame Color	NSN	Assign Date
Olive Drab Green	4240-01-504-6222	2003-02-03
Black	4240-01-504-5706	2003-02-03
Desert Tan	4240-01-504-5727	2003-02-03
Foliage Green	4240-01-540-5585	2006-05-24
Terrain Tan	4240-01-604-2788	2012-04-22

Reference: ESS Official NSN List (PDF)（2010-08）