Look at the spectacular successes they had (ignored by the drive by media) during Katrina.
I'd base the new units on the structure of a Marine Expeditionary Unit and base them at strategic points along our southern border (Yuma, Tucson, El Paso and Laredo, for example). They'd have responsibility for fixed sections of the border but be available to respond to disaster or attacks, as needed. In addition they'd provide the traditional "first responder" role of the Coast Guard, just to land locked areas.
Expanding on the Coast Guard instead of inventing a new organization should solve most of the problems that the gargantuan DHS has run into. The CG has an excellent infrastructure and command structure as well as a wonderful tradition to build on. They also don't fall under Posse Comitatus, so would have full police powers.
Krauthammer was on Fox a few hours ago...and said that we should start building 1, 2, 3, 4, whatever takes, fences...starting at the Gulf Coast AND the Pacific Ocean at the same time...and when they meet in the middle..
and the last GOLDEN STAKE is hammered in...then, and only then, do we start talking about a way for the millions of illegals that are here NOW becoming citizens or legal.
AND, there will be no more illegals bringing ever family member, aunts, uncles, cousins, neices, nephews, etc.
Sounded like a good plan to me...