I was on Dantes site looking for testing centers. It looks like this exam is only for Miltary folks. Are there testing centers anywhere other than a base?
Anyone may take these tests, although locating a testing center seems to have been a little more difficult for some. If you have a military base nearby, you might try contacting the education office to see if they would allow you to test. You might also inquire at local community colleges. I asked the director of the testing center at my local state university to apply, they agreed, and I took my first test three weeks later.
I think you can search for a test center here: http://www.istudysmart.com/testcenters.asp?mode=select Good luck!