United States Navy SEAL selection and training

The average member of the United States Navy's Sea, Air, Land Teams (SEALs) spends over a year in a series of formal training environments before being awarded the Special Warfare Operator Naval Rating and the Navy Enlisted Classification (NEC) O26A Combatant Swimmer (SEAL) or, in the case of commissioned naval officers, the designation 113X Special Warfare Officer. All SEALs must attend and graduate from their rating's 24-week "A" School known as Basic Underwater Demolition/SEAL (BUD/S) school, a basic parachutist course and then the 26-week SEAL Qualification Training program.

Source: Wikipedia — United States Navy SEAL selection and training (CC BY-SA 4.0)