The British Special Air Service (SAS) is a special forces unit of the British Army, known for its expertise in counter-terrorism, hostage rescue, and covert operations. Established during World War II, the SAS has a reputation for rigorous training and high operational standards, making it one of the most elite military units in the world. Members of the SAS undergo a demanding selection process, which includes physical endurance tests and survival skills. The unit operates in small teams and is often deployed in high-risk situations, both domestically and internationally, to protect national security and assist allied forces.