The team must find a terrorist who is planning to attack a nuclear waste train. On base, Kim becomes upset when she sees a strange man talking to her daughter, Serena, outside of school.

The team is sent to Africa on a mission to track down smuggled diamonds. On base, the wives organize "Old Home Week" to raise funds to help those in service in Iraq. Kim discovers an undelivered letter written by a soldier to someone he deeply loved, shortly before he was killed in action in 1944. She attempts to find the soldier's widow through his friend-in-arms and deliver the letter to her.