A ?? RE: one of the weapons being used in this movie...
...NOT really sure but to me the 'bazooka/rocket launcher' being used against the Ymir towards the end of the film sure looks like a German Panzerschreck rocket launcher:
http://homepage.tinet.ie/~nightingale/panzerschreck.html
Especially with the 'particle shield' in the front of the tube. I don't know if anybody can confirm or deny this, but thanks ahead of time.
Why can't you wretched prey creatures understand that the Universe doesn't owe you anything!?