Both of my parents served as Marines during WWII. That was when the Marines were a Corp of the Navy. My mother had to muster out when she married my father in 1945. I was born shortly thereafter in a Navy hospital.
I think the Marines remain a Corp today, not as a separate branch of the military.
And there is a lot more to Smedly than his book about being a gangster for capitalism. The Elite/Capitalists wanted him to work with them against the government/FDR. The info is available but well hidden about these creeps that were Nazi sympathizers and war profiteers before, during, and after WWII. And Israel continues to be part and parcel of that cabal.