Not very many people here in the midwest with a flat top since sometime in the late 1950's and I see very few tribal tattoos and sideways hat assholes here either.
Here is a list of U.S. Marine bases. You will notice that for some strange reason the MARINE bases seem to all be located near the coast, go figure.
Albany Marine Corps Logistics Base - New York
Beaufort MCAS - South Carolina
Camp Butler - Okinowa, Japan
Camp Lejeune MCB - North Carolina
Camp Pendleton MCB - California
Cherry Point MCAS - North Carolina
Cherry Point Naval Aviation Depot - North Carolina
Hawaii MCB - Hawaii
Marine Corps Recruit Depot - California
Marine Corps Logistics Base - New York
Miramar MCAS - California
New River MCAS - North Carolina
Parris Island Recruit Depot - South Carolina
Quantico MCB - Virginia
Twentynine Palms MCAGCC
Hate to break it to you, but as long as we are stereotyping people, my guess is that they are mostly from CA. Either that or Tom Brown stepped down with his posse from Canada for the weekend.