I've seen a number of MITO "elephant walks" involving B-52's, but this is the first I've seen featuring B-2's...
The US Air Force currently operates only 20 B-2s; thus, the eight aircraft that took part in the elephant walk and follow-up fly-off account for 40% of all B-2s currently in service.
It can be noted that the pic in the link above shows preparedness for MITO with the B-2's although the video below does not show the actual practice...



...Ben