A Marine with a Marine Special Operations Company (MSOC) pictured while on patrol in Helmand Province, Afghanistan, 2008.
Note the M14 DMR 7.62mmx51mm semi-automatic sniper rifle carried by the MSOC Marine.
Marine Special Operation Companies are elements of Marine Special Operations Battalions (MSOBs), themselves part of Marine Special Operations Regiment (MSOR).
There are 4 MSOCs per MSOB, each fielding 4 Marine Special Operations Teams (MSOTs) of 14 Marines.