I thoroughly enjoyed this animation. You show cased the main Warhammer 40'000 marine types, whilst also using there allies the Imperial guard.
What you did really well was maintaining the old 'USSR propaganda style' throughout with music that complimented it perfectly. To me, it felt like experiencing art rather than watching a narrative. Well done.

What I'd like to see in future:
Keep the qualities you have here tightly bound, yet original.
So, keep the visuals and sound in harmony. Because I see it as art, I'd love to see underlying questions or statements. It would also be interesting to see you develop it into a story. Keep up the good work.