re: #265 Belafon
I think of it this way: the air force doesn’t really make much sense as a separate entity. It’s either supporting a ground campaign, which puts it in the realm of the army, or a sea campaign, which puts it under the navy, or an amphibious campaign, which puts it under the marines.
And I found in my time in the Navy the Marines really hated to be reminded they are part of the Department of the Navy… .
The first job of the Marine Corps is they are the infantry for the naval forces. (Turns out you need that sort of thing, since ancient times.)