Loose Ends: The only hard part is the last part, where you have to escape. Once the download is done, exit the building killing the three or four enemies inside. Get to cover, kill any enemies near you, and run towards Ghost. Once you are ambushed, throw all the flash bangs and flank them, once they are dead run towards the objective.
The Enemy of My Enemy: This is one of the harder missions but you can make it easy if you don't fight anyone. The two groups will be fighting each other and they won't focus on you unless you run out in the middle or you shoot someone. Try to just sneak through the planes without firing unless someone is looking directly at you. Be careful when you are about to drop down out of the plane. Try to kill everyone you see before you drop down.