160321-N-AV746-051 CORONADO, Calif. (March 21, 2016) Lcdr. Mark Walton, assigned to Naval Special Warfare Command, shoots a modified M4 carbine during synthetic tactical marksmanship training. (U.S. Navy photo by Mass Communication Specialist 2nd Class Timothy M. Black/Released) Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/160321-n-av746-051-coronado-calif-march-21-2016-lcdr-mark-walton-assigned-to-naval-special-warfare-command-shoots-a-modified-m4-carbine-during-synthetic-tactical-marksmanship-training-us-navy-photo-by-mass-communication-specialist-2nd-class-timothy-m-blackreleased-image212951288.html
RMPACNF4–160321-N-AV746-051 CORONADO, Calif. (March 21, 2016) Lcdr. Mark Walton, assigned to Naval Special Warfare Command, shoots a modified M4 carbine during synthetic tactical marksmanship training. (U.S. Navy photo by Mass Communication Specialist 2nd Class Timothy M. Black/Released)