Yeah but in fairness he gets paid to do what he does on a very expensive and fragile instrument (check the insurance policies on those!) and generally indoors. They actually played along, just not amplified (I haven't heard if all their instruments stayed in tune though, that and string failure were the biggest reasons they recorded themselves two days prior).
The USMC band plays outdoors mostly and probably doesn't have too many fragile string instruments (nor heavy pianos!
At least they didn't insist on playing indoors and just jumbotronning it!
Edit - Nothing against the USMC band, in fact my cousin either was or tried to be a member (joined the USMC because they had the best band, he's a saxophonist...) I just like apples to apples.