I guess a IKTN question about military

So say the Marine Corps. how do they place different personal in different places?

I asked my father since he's retired Military and, according to him, they place you where they see fit depending on your job.  For example, when he was Active Duty in the U.S. Air Force, he was administrative/clerical, so they shipped him to an Air Force Base (AFB) in Kansas.  They do something what's called a Permanent Change of Station (PCS) every few years or so.

When he was promoted, the only slot available at the time was another AFB in Alaska.  So, basically, if there's an opening for your job, then that's where you go.  (Oh, and it's personnel, not personal.)

Ok, an example I have see young and fit Marines that all they do is walk the Tomb of the Unkown. Forty hours a week why not ready for combat?

That's their job.  That's what those soldiers wanted to do; respect the unidentified heroes that fought and died for country.  And, it's the U.S. Army that guards the Tomb of the Unknown, not the U.S. Marine Corps.

Everybody in the U.S. Military is prepared for combat.  This is why Basic Combat Training (BCT) exists.  If they were to be deployed, then they are prepared to fight in a war.

Hope this helps.