Nice; this is well written and has definite depth. It shows that those Imperial Guardsmen dying out there in massive droves had identities beyond their Unit Number. My only criticism is that one sentence is really awkwardly worded and sticks out.
One by one they fell to our lasguns falling overtop of one another, making piles of corpses.
This might work better as one, "One by one they fell to our lasguns, collapsing atop one another in massive piles of corpses." or something like that.
Overall this was a good piece and keep up the writing! I'm eager to read more from you.