It's possible this is well-known within the fandom, but somehow I missed it and I want to make sure no one else does. It's a music video for Band of Brothers by LithiumDoll, aka one of the best vidders of all time. I was astonished to see it exists, and unsurprised but very moved to find that it is a tragic and uplifting piece of exquisite art.
Click to view
Download it here I just - wow.