Armed Assault included features such as:
-Story driven singleplayer campaign
-Large scale multiplayer
-More than 30 weapons
-Vast environment to explore
-More than 30 modern vehicles
-HDR Lighting effects
-Real constellations and tides
-Built-in mission editor
USMC - United States Marine Corps
SLA - Sahrani Liberation Army
RACS - Royal ????
"A small US Army contingent has been sent to the Atlantic island of Sahrani with the purpose of helping to train the army of the local pro-American monarchy. The Kingdom of South Sahrani, rich in natural resources, has always been at odds with its Northern neighbor, the Democratic Republic of Sahrani. In recent years however, the situation has settled into an uneasy yet peaceful coexistence.
But the Democratic Republic of Sahrani sees the training of Southern troops by the US as a threat. When they learn that the US troops have finished their deployment and are in the process of shipping out, the North prepares to strike while a false sense of security still occupies the minds of their Southern neighbors. " - Extract taken from the Armed Assault Website.
Patch 1.08 also brings the Americans the A-10 "Tankkiller"
Here is a Youtube video showing detail of Armed Assault. The video is based on a Operation Restore Hope mission.
Black Hawk Down - ArmA-fied
ArmA also allows you to command your own squad, depending on your rank during the missions and in the editor. Different classes of soldier ranging from Rifleman to Medic, Anti-Tank, Sniper to Special Forces.