SEALs pioneered underwater warfare tactics, and are the only special forces personnel who are capable of advanced aquatic fighting tactics.
Basic Underwater Demolition school, known as BUDS, involves rigorous, gut-busting, nonstop running and swimming and surmounting obstacle courses.
Hell Week, five days of training, is all about getting and staying dirty, wet, cold and hungry.
The SEALs have expert snipers, able to blend in wherever they are.
Sea-to-land missions are among the SEALs most important, and emblematic, tactical calling cards.
During Hell Week, instructors like to keep recruits cold and wet for long periods of time to test their mental strength and physical limits.
The "A" in SEALs stands for air, as in jumping out of planes or rappelling out of helicopters. SEALs are trained to be diverse, to carry out missions anywhere and to get there by any means.