I saw the video earlier then I went to watch it again and it got pulled. To me the film was continuously filmed. If these were Army guys, there would be an American flag on the shoulder. Marines and Sailors do not wear any patches that are on the sleeves of the blouse, they have rank devices on the collar. The flak vest does look authentic but it looks like there is no SAPI plate inserted in the chest. The poor quality of the film does make it hard to see if the uniform is the DUU’s or the Marine Desert ditigals. The first thing I thought of was what weapon the person might be holding, but I could not see it at all up until the last half of a second before the film ended, it appeared to be something that looked like a rifle butt under his arm.
OTOH, there are some odd things about this video, so I'd like to know its provenance before giving it credence.