For this level, DO NOT parachute into the safe zone that is at the base of the tower. It may look safe at the green smoke, but there are half-tracks and very many german infantry that will pin you down. My advice would be to go from the top of the tower to the bottom, objective wise. As for the ending in Der Flakterm, sprint past all nazi storm elites on casual and memorize where the trail of wire is so you can get through it easier. On Normal, engage only a few nazi storm elites at the end. As for expert I haven't tried it yet so I have no advice just yet. HOPE THIS HELPS!!!!!!!!!