The squad is assigned to guard a prison that is in not so good condition and soon find themselves in a dangerous situation. Mrs. B temporarily returns home to care for her autistic son.

The squad faces a moral dilemma when they discover millions of dollars. Mrs. B returns from being AWOL and finds a friend in Dim. Meanwhile, Bo is training hard to return to his squad and Vanessa is sticking with AA and trying to make amends.

Angel puts his own life at risk when an American is held hostage. Meanwhile, Sergio and Anna's relationship continues to grow, and Venessa tries to make up for her past.

As the squad searches for an elusive bomber, they are joined by a squad of undertrained Iraqi soldiers. Meanwhile, Bo confronts his father and Vanessa continues to struggle with her alcoholism.

(Season Finale) The squad is assigned to protect a civilian convoy. Lt. Underpants leadership skills take a toll on the squad. Back at home, Bo meets somebody who may be able to help him get back in the Army and Sergio receives surprising news from Anna.