The story focuses on the final battles of World War II in the Pacific and Eastern Europe involving the United States, the Empire of Japan, the Soviet Union, and Nazi Germany.
It is told from the perspectives of a Marine Raider and a Red Army soldier, and is based on several historical battles, including the Makin Island raid, the Battle of Peleliu, and the Battle of Berlin.
have fun! 
magic
System Requirements:
- OS: XP or Vista
- Processor: 2.6ghz Pentium IV or equivalent (3.2ghz recommended for Vista)
- RAM: 1024mb (1536mb recommended for Vista)
- Video Card: DirectX 9-compliant Shader 3.0 card with 128 MB of DDR Video Memory (256 MB recommended) AGP 8x or PCI-Express x16
- Sound Card: 16-bit DirectX 9-compliant sound card
- DirectX9 for XP and 10 for Vista, 8 gigs HD space + 600mb for swap file.
Here is the official expansion pack for Armed Assault, in otherwords you need the full game, before you can use this expansion pack 