How about Anneke uses her Pazerfaust on the East objective, then goes S, chops that German (gaining another action), and comes back N and saves.
The medic is out of actions for this turn. The sniper, with the alarm sounded, can shoot the gas barrel on the exit (with SMG) to get it out of the way, then try to block an entrance.
30 enemy-1/2
7 enemy-1/2-gasmask
5 enemy-1/2-hammer
4 enemy-goliath/paratrooper
1 zero
so we can survive a couple of turns of the alarm going off (potentially 16 new enemies per, less blocks and sniper shots) but a turn without the alarm going off is better.
I note that the new enemies coming through there this turn will move north. Which suggests it would be a good candidate for a sniper shot.