atleast you have beaten that part of the mission. I snuck down to the first tank and placed the satchel charge. then i crawled back to the top of the hill. I shot the tank on the far right with the M136 and blew the satchel in one step. I am immedietly noticed and shot. I have tried a few different ways.. but i am noticed by the non-nvg wearing troops over and over.
edit: i blew up the tanks.. just cant seem to get that document. i gave up on it.