The recruits face the ultimate test as the Crucible pushes the limits of their endurance — and brotherhood is the only way to get past the finish line.

As combat training begins, a brutal mind game drives a recruit to the breaking point. A violation of protocol stirs trouble in the ranks.

The platoon grapples with the cost of being a Marine. Capt. Fajardo brings Staff Sgt. McKinnon up to speed. The mess hall lives up to its name.

Emotions run high as Cameron and the recruits aim to hit their marks in rifle training. Sgt. Sullivan lands in a very different set of crosshairs.

Amid a high-pressure week of swim training, Ray struggles to stay afloat — until Cameron dives in with a risky scheme to keep him above water.

Cameron digs deep to prove himself in a confidence-building course. The platoon receives a late addition. Barbara discovers sympathy has its perks.

A training exercise strains Cameron's bond with Ray and forces brothers John and Cody to unpack the family baggage they brought to Parris Island.

Without telling his mother, earnest teen Cameron impulsively follows his best friend Ray into the unforgiving gauntlet of Marine Corps boot camp.