Shouldn't matter that they are a military band. I played in both a military ceremony band and a military rock band in Northern California. In Miami, the Navy has a Steel Drum band that absolutely slams. I'm not sure what you're inferring here, but military bands can seriously groove. Maybe your experience differs from mine, and if that's the case, I can understand your statement. But, from my life path, military bands are a kick. Research some of the musicians who played in these bands throughout the years. Pretty mind blowing stuff.
Granted, this particular video performance is stiff, but it's not attributed to the mere fact they are wearing our countries uniform.