Army medics juggle personal matters amid dicey work conditions at a NATO base in Afghanistan.
Roback faces disciplinary action, Alvarez deals with trauma on the job and learns shocking news from home, and Roback and Davis's money-making scheme doesn't go as planned.
Roback, Davis and Petrocelli stumble on a puzzling operation, Alvarez faces a judgment call and a life-changing idea, and Durkin makes plans with Sasquatch.
Petrocelli tries to protect Buckley's goat, a search and rescue mission connects Alvarez with a local, and Davis's and Roback's scheme gets complicated.
Alvarez and Roback adjust to cohabitating, a communications blackout comes at a bad time for Davis, and Holloway proposes a plan to extend her deployment.
Following an attack on the base, Roback and Davis set out on a dangerous mission for medical supplies and Alvarez gets on-the-job training.
Roback reveals a dangerous secret to Alvarez, Davis takes a gamble to pay for his mother's treatments, and Holloway gets a tip that allows her to help the locals.
Alvarez and Roback land in hot water after taking the secretary of the Army on a helicopter ride, Sasquatch questions Durkin's loyalty, and Holloway faces a moral dilemma.
Roback and Davis simultaneously navigate a minefield and a rift in their friendship, Holloway finds a way to help Qasem's village, and Colonel Austin gets SecCorp's attention.
Alvarez and Roback's marriage is tested, the gang tries to track down the missing cash, and Holloway's dad discourages her from taking on SecCorp.
Petrocelli insists on following Roback, Davis and Alvarez on their unauthorized mission into Taliban territory, and Colonel Austin prepares for a confrontation with SecCorp.