After doing a google, apparently the sponge O'Grady used was made by Skilcraft, who employs the blind (NIB) to produce items. I don't know if this is air force issue, or if he just bought it himself, but the sponge in their catalog does not appear to be particularly special. If there is a specifically designed sterile version for air force E&E, then they don't show it in the catalog <img src="/images/graemlins/wink.gif" alt="" />
http://www.nib.org/products/products.htm
http://www.nib.org/JWOD%20Catalog/clean/main.html

Anyway,
I stopped by hobby lobby and bought a 4 pack of "painting sponges". They're blueish in color, 3" x 4 1/2" in size, and wafer thin... they really do expand to pretty thick when they touch water, but I'm afraid of trying to drink water out of them because I don't know what kind of chemicals were used during processing and compacting... they do have a very slight odor (the expanded one) so I'm just not sure...

What brand were yours?