Space Marine Animation WIP

I am in Animation 2 class and I accepted a challenge in my class from my teacher which was meant to out do every other student that he has ever had. Only 10 students have every accomplished all of the benchmark goals in his class in the decade + he has been teaching. I plan on being number 11. However I plan on going quite beyond by creating a MULTI character animation sequence with gunfire, movement, a grenade toss, and a resulting explosion.

I am thinking about modeling an enemy tank as well, just to give my Space Marines something to blow up.

If I have the time I will have Tactical Space Marines, a heavy weapons team, and a Sergeant (no helmet) with a jump pack.