Help identifying a badge, please

[flemming7x64]

Greetings out there from Denmark.
Can anyone identify this badge, which I believe is WW II, please. Any help highly appreciated.

Thanks,
- Flemming

Insignia.jpg (72.8 KiB) Viewed 321 times

PS: Measures app. 6x6cm

[John G.]

South Korean Marine Corps...so not WW 2, would have to see the back to judge the date, and know the size to tell if it's a collar or hat device.... there were ROK Marines in the Korean War.
John G.