What is the most difficult US military school?

It depends on what you're doing. Difficult is relative. What may be difficlut for one person may not be difficult for the other. Based on knowledge, the Navy's Basic Underwater Demolition School, or BUDs, which produces Navy SEALs, is considered the toughest selection process. However, the toughest, say, leadership school, is the Army's Ranger School, which is designed to simulate harsh conditions in combat and teach you to lead people despite overwhelming odds.

SERE-C... I'm going to leave it at that

During my service, I was given the opportunity to attend many of the schools that were available. They are hard, and they are hard for a reason. It takes a mental and physical commitment to pass these types of schools. Teamwork, fast thinking, are the best skills to traverse these schools by anyone. So stop complaining.

Well I've made many a Grown Ranger cry in the pool so I would say CDQC, tho certainly a different suck than Ranger school, the water is an unforgiving Bitch!

Field Sanitation. But only that one part about identifying STDs.

For the individual who said 25u, 25b is way harder not becuase of the school Perse but becuase we always end up doing the 25u job every where we go.

SF Q Course

On the aptitude side DLI manderine. On the physical/mental toughness side Ranger.

Army dive school was tough. 21d when I went in now 12d.

Back in the day (mid-80's), Navy Rescue Swimmer School was pretty tough!