HELP Stuck getting to the Observatory in Chapter1

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#1 Posted by brownwood09 (25 posts) -

So I eliminate the guys at the entrance, including th rooftop sniper and the heavy machine gunner.  As i go down the path staying on the left 2 choppers go by.  As I proceed the sniper never gets the idea to take out the jeep guard as a diversion.  All 3 guys just appear on my hud and then they come at me and kill me.  Help!