Great book on small US operations - The Savage Wars of Peace: Small Wars and the Rise of American Power by Max Boot
On the FAS, since John Pike left, it's a shadow of it's former self. He had some falling outs because he started to cover ops more than disarmament so he started a small (3-5 man) op out of his home.
http://www.globalsecurity.org/military/ops/index.html