Command and Conquer 3 Walkthrough NOD Mission 3, Hampton Roads

Start with your commando, making your way to the north. Use attack move ('A') to keep her on her toes. There is a rank crate on the ground to the northeast, which will come in handy. Don't go too far or you'll attack too much attention and she'll be overwhelmed. Look for more crates to the northwest. Take advantage of buildings as you move, to duck inside and avoid fire. Further to the northeast will be an APC. Fire on the explosive barrels (dumb GDI) and it will go up, freeing her to kill the remaining infantry. Get their attention and hop back into the building!

Head north to snag another health crate. When you approach the carrier, a GDI commando will use his jetpack and land next to you. Your veteran commando will make short work of him. Blow up the carrier and reinforcements will arrive in the form of a large army of fanatics and four venoms. Use the venoms to head to the southwest and eliminate all the snipers in the area, detonating barrels you see along the way to make it safe for the saboteur. Then, joining the venoms with the commando, mount an assault on the GDI base there. Kill all the infantry, using buildings to garrison the commando so she can shoot safely. Keep an eye out for snipers and grenadiers as they can take her out quickly. In that light, I recommend using 2 separate hotkeys for the venoms and commando. Keep your finger on the unload all button should you see grenadiers getting close to the building she's in, then make her run to another.

Doing this will free you to utilize your saboteurs against the GDI base. Head through the southern entry you revealed, and make sure to get all the unit production buildings and power plants. This will clear a path for the commando (who can use her explosives to eliminate anything that's left). Use the saboteur on the command post then run the commando straight at the building in a suicide run.