In real life, too.
You seem to have a lot of time in the corps. Do tell...
In non-fantasy land, Marines come in all sizes and shapes. Some short and stocky, some short and skinny, some taller and skinny, very few have the “bench press a car” build like in fantasy land.
But the fact remains, it was a stunt. The female, and her unit would get destroyed in any kind of fight with a Marine unit.
Everyone talks crap. Every hit movie is about a SEAL who has to save Marines. People say Rangers are better, or paratroopers are better, or the SAS, etc etc. Or they wax on and on about one special unit after another.
But the bottom line, the USMC fields 4 divisions of unstoppable badasses unmatched so far. At least until the Generals finish their evil work in destroying the corps.