I dread the expansion of nationalism into new frontiers. However, I'd be a fool if I expected such a useful tool to be abandoned. So, I think the exploitation and colonization of space to go much the same way as past, terrestrial, conquests, but with even higher stakes. The one consolation being that there are, as of yet, no indigenous peoples to be victimized.
All powers are foreign to someone (indeed, any power is foreign to most people) and the hypothetical/metaphorical ability to build a base on the far side of the moon is a simple problem of accounting. Even taken literally, the technical expertise is over half a century old and cost of delivering payload into space, even of trans-lunar injections, has been falling precipitously. From a US DoD perspective the concern is an eminently rational one...any nation-state potent enough to consider itself a rival, and even several non-state actors, could afford to take advantage of the relative neglect (borne from policies that still cling to cold-war mentalities) the US has had for space as a theater for conflict.
The only claims here, which are admittedly confused by flashy recruiting propaganda, is that space is a defense concern and that the US military is overdue for a branch that can give it the focus it deserves. The first is a given, and the second, while subjective, has been the subject of studies and expert analyses for decades and is a pretty straightforward conclusion given US military doctrine (being able to defeat any likely alliance of hostile powers) and national geopolitical aspirations (hegemony over all of creation).