Fox Nation goes inside Marine Corps' brutal training for exclusive 250th anniversary feature

"You have to earn the title [of] Marine," actor and comedian Rob Riggle, who formerly served in the Marine Corps, said in a sit-down interview with Shawn.

"You don't sign with a recruiter and show up to boot camp, and you're a Marine. No, you have to finish boot camp."

From day one, the transformation into one of America's elite fighters is grueling - a testament of mental fortitude, physical endurance and a malleable quality that time in training must shape.

Riggle described developing a "thick skin" as a part of that transformation.

"You get humbled very quickly," he explained, referencing the challenges a raw recruit faces from the beginning.

He also gives viewers an inside scoop into the toughest training at Marine bases across the country and deep dives into the mindset of Semper Fidelis in sit-down interviews with Riggle, Marine veteran and former bomb technician Johnny "Joey" Jones, and others.