This is the first ArmA 2 usermade campaign ever. It will start small but will develop into a crescendo of full scale war.
It consists missions of pure infantry combat in the Marine Force Recon team role. HALO jump from airplanes, helicopter insert into deep behind enemy lines, evade enemy patrols, gather reconnaissance info and when necessary, strike targets and disappear before enemy has any idea what happened.
Also check PMC Chernarus cmp manual.