There is SERE-A, SERE-B and SERE-C. The only things I know about A and B courses are what is on the wiki page. SERE-C is a full up 2 week course at one of the SERE locations, which includes about a week of classroom stuff and then another week of field-based practical experience. Part of this is basic survival (which is not really new to most military members), another portion is evasion training, and the third part is the resistance lab portion (which details issues related to short and long term captivity). The resistance stuff is all confidential or secret, but you can probably use your imagination and guess what it entails. SERE-C is for folks in jobs that are considered to be at high risk for capture. This includes primarily pilots, nav types, though it also is given to enlisted aircrewmen, and special operations forces folks.