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Units, weapons and vehicles is where ArmA 2 mods really get exciting, with replacement units available for quite a few different countries and defence forces, allowing players to represent different armies if they wish to. Replacement weapons and vehicles have different statistics, allowing players to try out new things for a challenge or to make things a little easier.
The British 3rd Para mod allows to play as the British 3rd Paratrooper Battalion, allowing players to act out a campaign as a paratrooper dropped in to Chernarus if they wish. The models and textures in the mod are also of a high quality.

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The
Desert Mercenaries and BlackOps mod is the most popular file on Armaholic, with close to 100,000 hits since its release in early 2010. It adds a huge amount of different mercenary and special forces skins.
The Desert USMC Units mod is a simple reskin of the original USMC models with a Desert camouflage pattern, becoming more suitable for use in desert or arid missions.