U.S. Marines with Black Sea Rotational Force 17.1 sight in down range during combat marksmanship training at Mihail Kogalniceanu Air Base, Romania, April 6, 2016.
The course was designed to test Marines on their ability to fire well placed shots while engaging a target either standing or moving. (U.S. Marine Corps photo by Cpl. Sean J. Berry) Original public domain image from Flickr