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.

Bob and his translator are stranded in the Russian wilderness after their helicopter crashes. As Bob fights to save his translator's life, he remembers his experience during Unit selection through a series of flashbacks.