I just searched the US copyright office and couldnt find a listing for it.  I also noticed the following...

www.copyright.gov/circs/circ1.html#piu

Publications Incorporating U. S. Government Works

Works by the U. S. Government are not eligible for U. S. copyright protection. For works published on and after March 1, 1989, the previous notice requirement for works consisting primarily of one or more U. S. Government works has been eliminated. However, use of a notice on such a work will defeat a claim of innocent infringement as previously described provided the notice also includes a statement that identifies either those portions of the work in which copyright is claimed or those portions that constitute U. S. Government material.

   Example: © 2002 Jane Brown. Copyright claimed in Chapters 7-10, exclusive of U. S. Government maps

Copies of works published before March 1, 1989, that consist primarily of one or more works of the U. S. Government should have a notice and the identifying statement.

you can't copyright a name, you trademark it.

if you are referring to the pattern, they could have patented it.

Not the name; the pattern

yup, patented...just found it

I prefer CADPAT over MARPAT