DaveReidUK, Pali:
Living all my life at the (Russian) AF bases and serving at the AF for about 25 years, my strong opinion is that no real military cargo is transported during such flights, with a crowd of civilians (here, musicians, chartity fund activists and especially journalists) with no clearance, etc. Plus, this plane is indeed a civilian passenger one and AF have many other planes available for all kinds of military cargo.
One may call this plane military but it is the same situation when a multi-star general uses a regular Escalade with a driver for every day trips to Pentagon and then back home to a nice Virginia neighborhood. Would this car be considered military?