Ummm...I will respectfully defer to any Devil Dawgs on here, but I
think the "Marine regalia" mentioned by the article writer here is akin to "SA Misconceptions,"
and the writer got the wrong idea it was a uniform. These fine Marines are part of a special greeters' group, and I believe what they are wearing is a made-up thing, with that great red jacket a mark of Service pride and distinction for their organization. As JAM noted, they might not even be military, but they are proud to wear a "uniform" for their organization. As a former/retired military member, you can wear some of your decorations on civilian clothes for military-related events. Throw on a red jacket with an organizational patch, spice it up with a cummerbund for evening, and you are ready to party.
That said, this group, the USO and many other volunteer groups who greet returning deployers at airports and do many other wonderful things for the military and their families, are just magic.
I personally love The President's Own, the Marine Band group, when they appear in their red uniforms, which are unique to them, I think. Check this out:
http://www.marineband.usmc.mil/