The question...

[jmm99]

as an amateur (in the original sense of that word) in Marine history (US and CFM-Canada), I'd suggest that the two Marine kids - more likely grandkids to me - can do what they are doing because Marines are both general purpose and special operations oriented creatures[*].

They also have had combined arms for so long that they think it's a genetic feature. And can mix and match, shrink and grow, with reckless abandon (MAGTFs).

The GPF and SOF discussion(s) [re: GPF and SOF dividing lines, assuming that both of them are monoliths, which they seem not] is perceived by this detached and armchair observer to be primarily an Army thing. Although DoD Dir 3000.05, if executed fully, would affect all the services.

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[*] marsouins - sea hogs, the marine mammal with the most brains, even though no one but themselves understand their language and habits.

PS: like the photo with kids on your personal page.

[selil]

The GPF and SOF discussion(s) [re: GPF and SOF dividing lines, assuming that both of them are monoliths, which they seem not] is perceived by this detached and armchair observer to be primarily an Army thing. Although DoD Dir 3000.05, if executed fully, would affect all the services.

You are correct. Though the other forces would disagree they are not organized that way.