As a test of their character, they are tasked with a 2-mile race, navigating treacherous terrain, while carrying a 220-pound boat.

The final group of remaining recruits attempt to go behind enemy lines without being captured, and face tough lessons of survival, leadership and how to decipher a map.

The recruits were split into teams and competed in a grueling race under the scorching heat, aiming to be the first to complete the course. This task tested their physical limits and ability to work together under extreme conditions.

The last remaining recruits face their final phase -- enduring the mental duress of enemy interrogation.

The celebrity recruits are put to the test of safely protecting a convoy under a surprise attack.

The recruits face the most dangerous task yet, a helicopter survival drill, as a test of their ability to mentally handle a life-or-death situation.

As the recruits make their way to base, they are faced with initiation and their first brutal challenge: repelling out of a military-grade helicopter. Later, the recruits get a taste of what it's like operating behind enemy lines as they carry supplies weighing 800 pounds in sweltering 100-degree heat.

Contestants take on a search-and-rescue course, crawl over a rope spanning a canyon and face a brutal three-stage endurance test

The recruits must trust each other in order to survive.

Celebrities endure some of the harshest, most grueling challenges from the playbook of the actual special forces selection process; their goal is not to win votes and face eliminations -- for them it is just about survival.

The recruits face a skyscraping tactical repel and a high-pressure simulation.

With nothing more than a radio kit and each other, the recruits must communicate effectively and move quickly as they work together to identify fallen comrades in a casualty evacuation test behind enemy lines. Then, when their team's mission is compromised, they must cross rooftops to make it to extraction.

In one of the most intense physical challenges yet, the remaining recruits are split into two teams to attempt an extraction operation and are uplifted by heartwarming messages from home.

In the final week of selection, the recruits are subjected to a multi-stage process of interrogation and are placed under gradually increasing duress.

The recruits must perform under stress, but also learn from failure (as some pairs did) and improve their mindset. The staff keep pushing the notion that attitude matters as much as skill.

The celebrity recruits must have trust in each other and in their leaders in order to survive; each recruit must rely on another to break their fall from a skyscraping cliff.

A new troop of 14 household names face the harsh reality of winter warfare training.

Recruits must unlock a safe in a gas-filled room, perform a helicopter insertion into the blistering cold sea, and select recruits are forced to bury their teammates into coffins after cheating in a previous challenge.

The recruits are taken to a remote mountain range where they are tasked with pulling sleds through two miles of dangerous terrain, then later escaping invasion from enemy hunters, before they take on their last 24 hours of selection.

The recruits are split into teams and face a high-stakes physical challenge: they must sidestep along a 165-foot rope suspended above a canyon floor, testing balance, coordination, and nerves. Once on the rope, the teams must fight to get a ball over the opposition’s goal line — turning the rope traverse into a competitive “murder-ball” style exercise under extreme conditions. The episode is described as pushing the recruits’ grit: physically, mentally, and as a team.

The recruits undergo a search-and-rescue course, crawl along a rope suspended over a canyon, face a grueling three-stage endurance test in the mountainous terrain, and a brakeman rope challenge.

Challenges include treading water as a group and bungee jumping off a 12-story viaduct.