This is a trailer for a fan-made series based on the Halo videogames. From the website Helljumper.com:
Halo Helljumper is a short series of films that follows the life of one human ODST from his enlistment in the UNSC before the Human-Covenant War to around the Fall of Reach. Unlike a lot of soldiers, he was lucky enough to survive through 27 years of a losing battle against a hostile alien civilization, known as the Covenant. Through his experiences, we’re going to expose you to an amazing universe full of devastation, grief, affection, and most importantly, hope.
Adapted from the short story, “Dirt,” by Tobias S. Buckell
Can’t wait for the first episode!