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.

Trevor has difficulty adjusting to new houseguests; Denise encounters an old friend on the base; Pamela struggles with being so far away from Chase.

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.

Roxy is given an opportunity to be more involved in the Army; tension escalates between Claudia Joy and Jackie; Gen. Clarke chastises Joan for not combining the bases quickly enough.

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.

Claudia Joy experiences medical complications related to her diabetes. Meanwhile, Frank gets involved in a political upheaval in Africa; and Finn's birthday is celebrated.

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.