Colonel McNulty finds himself at odds with Major Jim Tisnewski. The major must convince his superiors at the Pentagon and the Joint Chiefs of Staff that the United States should risk war with China to rescue an American operative.
McNulty sends JT on a mission to Iraq to find out why there is unauthorized covert action and if the United States is illegally treading on Iranian soil . However, he winds up wounded and is forced on the run. Sonny and Algazi assemble a team to rescue JT from Iraq. McNulty gets charged with sexual harassment by the Inspector General.
Two US Marines are accused of raping a young local woman in Surinam. JT learns of this and he immediately jumps to action only to find opposition from above. The United States doesn't want to jeopardize it's aluminum interests controlled by the Surinamese government. He must navigate the political maze to discern the truth and try to save the soldiers' lives.
McNulty discovers that a captured Navy Seal could be alive and he and JT are set to save the man. However, they soon face resistance from the Pentagon and might have to do what is known as a "backdoor" mission to save the soldier. Also, more about McNulty's mysterious past is revealed during this endeavor.
In North Korean waters, a submarine that Bobby's team is on collides with a North Korean nuclear submarine, damaging it. The Korean commander is eager for the Americans to save his crew, but he must work against his own countrymen, who have sent another vessel to kill everyone aboard rather than allowing the Americans to get their hands on the Korean submarine.
On a mission to train an elite Iraqi secret service unit, JT and Bobby befriend an Iraqi soldier who doesn't know his brother is a suicide bomber fighting against the American occupation. Meanwhile, Sam accompanies a Congressional delegation to Iraq and becomes trapped by the bomber on a military base with JT and Bobby.
After escaping from the hands of Mexican Police following a doomed operation, JT and his team end up killing a drug gang and a federal agent on the American side of the border. As the team was debriefing in a Miami hotel, Sonny and McNulty were trying to solve the crisis started by a mole inside the Pentagon.