Chespace, the documents are inside the building marked on the map by an objective marker ontop of desk. I actually managed to complete manhattan, however it should really entail shooting a marine with a javelin on his back in order to have something to kill the tank at the insurgent base...:P.
One thing i cant get my head around is why Captain Dressler (the intel officer) is English...other than that, the campaign has thousands of little niggles and bugs that generally discourage me from playing it, thats the main problem. BIS best get it sorted if they actually want to draw in new players (and customers, for that matter), not rely on an already established community.