BUD/S is a 24-week training course that develops the SEAL candidates' mental and physical stamina and leadership skills. Each BUD/S phase includes timed physical condition tests, with the time requirements becoming more demanding each week. BUD/S consists of a three-week orientation followed by three phases, covering physical conditioning (seven weeks), combat diving (seven weeks), and land warfare (seven 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 has been controversial due to candidates' use of performance-enhancing drugs and a number of candidate deaths.
Pre-BUD/S or BUD/S Orientation (3 weeks) Pre-BUD/S or BUD/S Orientation, previously known as Indoctrination (Indoc), is a two-week course that introduces candidates to the Naval Special Warfare Center and the BUD/S lifestyle. Navy SEAL instructors introduce candidates to BUD/S physical training, the obstacle course, swimming and other unique training aspects. This part of training is designed to prepare candidates for day one of First Phase.
Phase 1: Physical conditioning (7 weeks) The first phase of BUD/S assesses SEAL candidates in physical conditioning, water competency, teamwork, and mental tenacity. Physical conditioning phase utilizes daily running, swimming, calisthenics, and grows harder as the weeks progress. Candidates are also divided into "boat crews" consisting of six to seven people with one small inflatable boat known as an IBS, and must paddle out from the shore, through the
surf zone, and back again. Candidates participate in weekly timed runs in shorts and sneakers (previously in boots and pants) and timed
obstacle courses, swim distances up to two miles wearing fins in the ocean and learn small boat seamanship. Candidates that consistently do not meet specified time requirements for running and swimming tests are dropped from training. The first three weeks of basic conditioning phase prepares candidates for the fourth week, known as "Hell Week". During Hell Week, candidates participate in five and a half days of continuous training. Each candidate sleeps at most four hours during the entire week, runs more than , and does physical training for more than 20 hours per day. Candidates are not restricted from meals and are fed breakfast, lunch and dinner. The remaining three weeks involve the acquisition of various methods of conducting
hydrographic surveys and creating a
hydrographic chart while still participating in timed runs and swim tests.
Phase 2: Combat diving (7 weeks) The diving phase of BUD/S training develops and qualifies SEAL candidates as competent basic combat swimmers. During this period, physical training continues and becomes even more intensive. This second phase concentrates on dive physics, underwater skills, and combat SCUBA. Candidates will learn two types of SCUBA:
open circuit (compressed air) and
closed circuit. Also, basic dive medicine and medical skills training is provided. Emphasis is placed on long-distance underwater dives with the goal of training students to become basic combat divers, using swimming and diving techniques as a means of transportation from their launch point to their combat objective. This is what separates SEALs from all other US Special Operations Forces. For the final five weeks of training, the class goes offshore, about from Coronado to
San Clemente Island. On the island, the class practices the skills they learned in the third phase. The days become longer and more work-intensive, set to mirror the work hours spent in the field. Many students view this as one of the hardest parts of training, as training is conducted seven days a week, with very minimal sleep, all while handling live explosives and ammunition. Interaction with instructors is also never-ending, and punishments are at their harshest levels yet. By the end of the Third Phase, candidates must complete a timed 2-mile ocean swim with fins in 75 minutes, a 4-mile timed run with boots in 30 minutes and a run. ==Parachute jump school (3 weeks)==