I haven’t even seen the video but I can see from a quick read of the thread that many here have an agenda and this thread is serving a purpose.
There is the distinct possibility that we are looking at a "black op" video from some leftists pretending to be U.S. Marines, with the intention of discrediting the military. In the movie "1900", there was a scene where Donald Sutherland, who played the role of an Italian fascist leader, stomped a kitten to death to show his mercilessness. To indicate a similar mentality may be the hidden agenda behind this video. It is easy enough to dress men up as Marines and shoot the video in the California or Arizona desert. As short as the video is, it would be difficult to be caught on telltale signs that would indicate fakery.