1. Roughest, Toughest Bastards

As the 31st Marine Expeditionary Unit prepares to deploy in the Pacific, they kick off grueling tests of combat readiness — and failure isn't an option.

2. Contested Waters

While transporting the 31st MEU, Navy vessels encounter a foreign spy ship. Later, the Marines continue CERTEX to test their skill, unity and resolve.

4. The Few, the Proud

The USS America and USS Green Bay head to port — until global events demand a sudden change in mission. At home, several Marines consider what's ahead.