just forget bout the courtyard, go to the toll booth and if you throw a nade, run into its smoke throw another one and do the same thing you can get across the courtyard w/ just 3 good placed smokes, and if you dont have med kits and all you have are smoke you can get through the whole level w/o killing anybody.
Easiest mission
If you wanna do something fun do Kingfisher w/ 552 & front grip w/ suppressor. Its funner w/ M16 high scope and ext. clips