[Suhiir]

I've worked with ROK Marines a few times and VERY thoroughly believe their unofficial motto "ROK Hard" is well deserved.
I'd say in attitude and training they're easily on par with the USMC, if not a step or two ahead.

While it would certainly be possible to go thru the OOBs and modify and any all such units (SAS, Green Berets, Spetsnaz, the list goes on...) to give them similar slight advantages I'll mention researching and rebuilding the USMC OOB was around 4-800 man-hours of work. Now multiply that by 91 OOB's (seeing as 1, the USMC is already tweaked) and the simple answer is ... it ain't gonna happen.

Now, if it bothers you enough to do ALL the research yourself and create a custom OOB, based on verifiable research NOT "best guess" go for it !