As a subject matter expert in military history and special operations, I have spent considerable time studying the various special forces units around the world. It's a fascinating field, with each unit having its own unique strengths and capabilities. When discussing the "toughest" special forces, it's important to recognize that this is a subjective term and can vary depending on the criteria used for evaluation. However, there are several units that consistently rank at the top due to their rigorous training, operational history, and the high standards they maintain.

The British SAS is often cited as the progenitor of modern special forces. Formed during World War II, the SAS has been a model for many other units around the globe. Their selection process is notoriously difficult, with a high attrition rate, ensuring that only the most capable individuals make it into the ranks.

The U.S. Navy SEALs are renowned for their maritime counter-terrorism, unconventional warfare, and direct action missions. The SEALs' training program, known as Basic Underwater Demolition/SEAL (BUD/S), is one of the most demanding in the world, pushing candidates to their physical and mental limits.

Russian Spetsnaz are the special purpose forces of the Russian military, known for their versatility and ability to operate in a wide range of environments. They have a storied history and have been involved in numerous high-profile operations.

The U.S. Green Berets, officially known as the U.S. Army Special Forces, are known for their expertise in unconventional warfare, foreign internal defense, and special reconnaissance. They are also known for their ability to work closely with indigenous forces.

Delta Force, officially known as 1st Special Forces Operational Detachment-Delta, is one of the most secretive and elite counter-terrorism units in the U.S. military. Their missions are often classified, but their reputation for effectiveness is well-known.

Shayetet 13 is the Israeli Navy's elite special operations unit, specializing in maritime counter-terrorism, naval intelligence, and other special operations.

The Pakistan Special Service Group (SSG) is the special operations unit of the Pakistan Army, known for their high-altitude mountain warfare capabilities and other special operations.

The U.S. Rangers are an elite light infantry combat formation in the U.S. Army, known for their ability to conduct a wide range of complex, joint special operations missions.

It's important to note that the effectiveness of these units is not solely determined by their individual capabilities but also by their integration with other military assets, intelligence support, and the strategic context in which they operate. Each unit has its own unique strengths and is tailored to the specific needs and strategic objectives of the nation it serves.

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Green Berets. The U.S. military is full of rough and ready soldiers. ... The Night Stalkers. ... FAST. ... 75th Ranger Regiment. ... Navy SEALs. ... Delta Force. ... Force Recon. ... MARSOC.More items...read more >>