The sixth season begins with the tribe preparing to leave Fort Marshall, but Roxy isn't prepared to move. Meanwhile, Joan gets the fort ready for a hurricane; and Denise and Frank celebrate Molly's first birthday.
Denise fights for her life after a hurricane hits the hospital; Pamela searches for a place to live after her apartment building is destroyed; Joan gets overwhelmed trying to manage the aftereffects of the storm.
Claudia Joy is threatened by Denise's friendship with Jackie Clarke and confides in an old friend; Roland is given a unique opportunity at the Youth Activities Center; Roxy adjusts to her duties as an officer's wife.
David is involved in a sports-related accident with a classmate, which leads to controversy. Meanwhile, Claudia Joy's dislike for Jackie damages her relationship with Denise; Trevor and Roxy offer advice to a soldier and his wife.
Tanya and Dr. Hanson try to save the life of a wounded soldier. Meanwhile, Denise and Jackie visit the injured man's family; Roland learns that Charlie is in a relationship; and troops confront a tribal militia outside a medical clinic.
Nicole negotiates a resolution to the conflict with the militia in Africa, but then she is wounded. Meanwhile, Frank, Trevor and Hector evacuate the last remaining Americans but are forced to leave behind local orphans.
Denise worries about Frank when he returns restless from Africa; Jackie is overwhelmed with her Army duties; Roxy and Trevor give financial help to Gloria and Hector; Roland and Joan invite Charlie and Nicole over for dinner.
Roland meets a man who claims to be David's biological father; Michael investigates the incident at the African orphanage; Jackie sinks deeper into her prescription-pill addiction; Frank continues to be haunted by the orphans.
Denise offers C.J. her kidney, but Frank thinks it's too risky. Meanwhile, Roland and Joan meet with C.J. to discuss the legal issues surrounding David's biological father; and Hector tells Gloria she should quit work because he doesn't like her flirting with customers.
Michael is promoted to Corps Commander, and Audrey tells CJ that she helped get him the promotion and she wants payback. Meanwhile, Frank questions his resolve as a soldier; Roland and Joan struggle with David's desire to spend time with his biological father.
Claudia Joy recovers from surgery; David communicates with Marcus behind Roland and Joan's back; Trevor worries that Roxy is taking on too much while pregnant; a beach trip turns into a terrifying ordeal for two wives.
Trevor's buddy Cory arrives at Fort Marshall with his wife to have surgery on his burn injuries; Hector tries to reconcile with Gloria; Jackie gives Claudia Joy lessons at the gun range; Denise attempts to move past the beach-house shooting.
Claudia Joy helps retired veterans with their legal problems; Roxy worries about Cody's depression; Trevor urges Hector to see a marriage counselor; Nicole gets upset when Charlie breaks the news of their engagement to Nicole's unsupportive mom.
Roxy goes into labor, and she and Trevor argue about his military career. Meanwhile, Denise considers becoming a nurse practitioner; and Jackie becomes frustrated with how easily Sophie manipulates her father.
Military dignitaries visit Fort Marshall to celebrate its centennial. Meanwhile, Hector and Gloria deal with the repercussions of Penny's return; and Roxy and Trevor worry about the health of their babies.
The tribe deals with consequences from the centennial celebration; Roxy and Trevor take Drew home from the hospital; Denise and Roland suspect that one of David's friends is being abused; Gloria confides in Jackie about her impending divorce.
Roxy and Trevor plan for the future; Roland's treatment of Marcus causes problems with Joan; Sophie becomes the target of Kevin's frustration; fertility issues leave Charlie and Nicole feeling discouraged; and Gloria returns to take on new duties at the bar.
News spreads that Fort Marshall will merge with an Air Force base; Kevin experiences a medical breakthrough; the troops return to Afghanistan; Joan makes an important decision regarding her career; Charlie and Nicole investigate adoption.