Oh dude, this is for the Basement Jam, damn, good one.
Well, the animation is good and smooth enough. I think it could have used some shading and smoother lines in the art. The story is not too original, but it never fails to be touching.
I think you could have done a bit better about the soldier. He should feel afraid of his superior finding him hesitating to kill them, you could also have made him stutter a bit when telling his lie.
And I think that his grin in the end wasn't the right mood, he should look moved and touched by what he saw. Maybe you could have made him look thoughtful, as if he was questioning himself and the cause he fights for.