In "Fleet Action," the Joint Chiefs of Staff were the heads of the Army, Marine Corps and Navy, whereas in the modern U.S. forces, the JCS are the heads of the Army, Air Force and Navy.
Is the Space Force perhaps an arm of the Navy? If they were, it would explain why Space Force personnel ship out on Naval carriers so often, and how they can shift back and forth between Space Force and Naval ranks.
In all of the Chris Roberts WC games, the Space Force is exclusively responsible for fighter operations - ALL fighter personnel in WC1 through WC4 held Space Force ranks. On the other hand, in WCProphecy, there is some overlap, with the commander air group being a Naval Commander, rather than a Space Force Colonel.
Fortunately, there isn't as much overlap as there is in Forstchen's novels, wherein Naval and Space Force personnel seem to be almost interchangable - Lieutenant Commanders seem to frequently fly on the wing of Majors.
So what gives here?