I'd like to save someone's time by providing resources I found useful in completing the ArmA2 campaign.
Note:ArmA2's campaign has multiple endings based on your completed objectives, so certain missions may not apply.
BE AWARE: These links are walk-through and will have spoilers.
Top linkMission: Razor Two
Middle LinkMission: Manhatten
Bottom LinkMission(s) Guide:
Again, there are multiple endings. I recommend completing all objectives (including "Find Evidence".