Where Are the Wounded of Benghazi ? (2)

The stonewalling and cover up continue in regard to Benghazi. At least it is open knowledge that many are at Walter Reed Hospital in Bethesda.

http://www.foxnews.com/politics/2013/03/06/lawmakers-demand-access-to-survivors-injured-in-benghazi-attack/

Question: Are each and every one of the survivors still in Walter Reed or other hospitals? Surely a couple are able to be interviewed. Why is it that the administration does not want them interviewed by Congress? Is it true that those at Walter Reed are under guard as reported in the first link above?