Arma 2: Reinforcements includes the "British Armed Forces" and "Private Military Company" DLCs. If you own the Arma 2: Combined Operations package, you may already have this content, but the standalone key will grant access to the specific expansion content separately.
: The game is frequently available on Steam, often bundled in the "Arma 2: Combined Operations" or "Arma 2: Complete Collection" packages. Buying here automatically activates the game on your account without needing to manually enter a key. arma 2 reinforcements cd key
Restart Steam completely. If still missing, go to your library filter and ensure "Hidden Games" is visible. Sometimes Reinforcements is listed under "Software" or as a DLC for an unowned base game. Arma 2: Reinforcements includes the "British Armed Forces"
Many mods, like the original DayZ, require these assets. you may already have this content