One of the best things about Ghost Recon is it's nonlinearity. Though mission conditions will dictate certain strategies, there are still many ways to complete a mission. Each walkthrough I have written is only one way to complete the mission.
I included replay files (.rpf) that show each mission completed successfully. You can right-click and save the replay files and place them in your replay directories.
For the original mission pack, the default replay path is:
C:\Program Files\Red Storm Entertainment\Ghost Recon\Mods\Origmiss\Save\Replay
For the Desert Siege mission pack, the default replay path is:
C:\Program Files\Red Storm Entertainment\Ghost Recon\Mods\Mp1\save\replay