Hardest Military Training in the US?

I'm looking for a real challenge and am considering joining a military branch right after high school. I've heard that some of the training programs are incredibly tough, but I'm not sure which ones. Which US military branch supposedly has the most demanding training, and why? Has anyone here been through it and can share their experiences?

Most people often consider the U.S. Navy BUD/S training as the most challenging military training in the United States due to its intense physical and mental demands. It is part of the process to become a U.S. Navy SEAL, which is one of the most elite special operations forces units.

Basic Underwater Demolition/SEAL (BUD/S) training lasts about six months and pushes candidates to their physical and mental limits. It's divided into three stages: Physical Conditioning, Combat Diving, and Land Warfare Training. Each stage is intended to test and build different skills needed for actual field operations. For example, the well-known "Hell Week" during Physical Conditioning that involves sleep deprivation and constant physical exercises, is designed to test candidates' endurance and teamwork under extreme stress.

However, it's also important to mention the training of other special operations units such as the U.S. Army Green Berets or Rangers, and the Air Force Pararescue - all of which are also extremely physically and mentally demanding.

Still, whether a training program is considered "hard" or not can heavily depend on an individual's strengths, weaknesses, readiness, and personal disposition. While I haven't personally been through it, I've heard from many who have that although these programs are challenging, the sense of accomplishment and camaraderie they experienced was worth the effort. Remember, each branch of the military has a unique mission and purpose, so choosing the one that aligns with your personal and career goals is as important as challenging yourself.