I found this site while looking for information on Commissioning programs for my son. It appears to be set up by those folks at the joint recruiting section of DOD/DHS. It is full of good information about enlisted and officer programs. More importantly, for me, there are leads on those programs that will get your college education funded by the military(ROTC/Academy/GI Bill). While not exhaustive, it helps. http://www.careersinthemilitary.com/index.cfm?fuseaction=main.home (http://www.careersinthemilitary.com/index.cfm?fuseaction=main.home)
What I don't see here are the various state military and merchant marine academies. Hope this helps anyone on the hunt.