What do you think is the toughest school in the US Military?

So, me being an Infantry Recon type, I have had the opportunity to attend some very difficult schools. What I pose is a two part question -- a very tough short school and a very tough long school. I won't put any more restrictions on that. It could tough mentally, physically, financially, tough on family, tough on your body. You were the one going through it...so you get to talk about it.
Two of the most difficult schools? hmmmn...Amphibious Recon School was tough, classroom and PT, long hours, I barely remember some parts...and Army Ranger School. I hallucinated in the Mt. Phase and fell asleep walking in FL phase. Both of those are considered long schools. The toughest short course had to be SERE school at one week.