Upon arrival at Naval Special Warfare Command, check-ins for BUD/S are immediately placed into a pre-indoctrination phase of training known as 'PTRR', or Physical Training Rehabilitation and Remediation. PTRR is also where all of the 'roll-backs' are placed while waiting to be put into a class. Once additional medical screening is given, and after enough BUD/S candidates arrive for the same class, organized physical training begins.
BUD/S consists of a three-week 'Indoctrination Course', known as INDOC, followed by three phases, covering physical conditioning (seven weeks), diving (eight weeks), and land warfare (nine weeks) respectively. Officer and enlisted personnel go through the same training program. It is designed to develop and test their stamina, leadership, and ability to work as a team.
BUD/S consists of a three-week 'Indoctrination Course', known as INDOC, followed by three phases, covering physical conditioning (seven weeks), diving (eight weeks), and land warfare (nine weeks) respectively. Officer and enlisted personnel go through the same training program. It is designed to develop and test their stamina, leadership, and ability to work as a team.
In the first phase, BUD/S students are divided into 'Boat Crews' which can consist of six to eight men. Although some exercises will be undertaken as boat crews (such as 'log PT', which requires boats crews to exercise with logs that weigh 150 lb (68 kg) each, and 'Surf Passage', where boat crews must navigate the Pacific surf in inflatable boats), the first phase of BUD/S also consists of a series of demanding individual physical tests including frequent sets of push-ups and sit-ups, ocean swims and timed 4 mi (6.4 km) runs in boots and long trousers, in soft sand (to be completed in 32 minutes). The first phase is most well known for 'Hell Week', 132 hours of continuous physical activity, which usually occurs during week four. A student may drop on request (DOR) from the course at any time. The tradition of DOR consists of dropping one's helmet liner next to a pole with a brass ship’s bell attached to it and ringing the bell three times (the bell was taken away for a few years in the 1990s, then later brought back).
Classes typically lose around 70–80% of their trainees, either due to DORs or injuries sustained during training, but it is not always easy to predict which of the trainees will DOR during BUD/S. Winter class drop out rates are usually higher due to the cold. SEAL instructors say that in every class, approximately 10 percent of the students simply do not have the physical ability to complete the training. Another 10–15 percent will definitely make it through unless they sustain a serious physical injury. The other 75–80 percent is 'up for grabs' depending on their motivation. There has been at least one BUD/S class where no one has completed the program. Most trainees are eliminated prior to completion of Hell Week, but trainees will continue to DOR in the second phase or be forced to leave because of injuries, or failing either the diving tests or the timed runs and swims. In fact, the instructors tell the students at the very start of BUD/S that the vast majority of them will not successfully complete the course and that they are free at any time to drop out (via the bell) if they do not believe they can complete the course. A trainee who DORs from First Phase before the completion of Hell Week and reapplies to the BUD/S program must start from the beginning of INDOC (if they are accepted). Any BUD/S trainee who drops on request after Hell Week goes through the same out-processing as a trainee who quits before or during Hell Week. If they reapply to BUD/S they would stand a very good chance of being accepted, but they must complete Hell Week again.
However, those who have completed Hell Week, but cannot continue training due to injury are usually rolled back into the next BUD/S class after Hell Week, or the respective phase in which they were rolled. There are many SEALs who have attempted BUD/S two and even three or more times before successfully completing training.
