When frozen bodies are found in Nevada floating in water, the BAU's investigation leads them to suspect that the victims were part of a cult that could be behind the deaths, in an episode entitled "The Forever People"
Rossi: Hernandez? But why? Sergeant Scott: Why did he do it? Or why did I take credit? Rossi: Both. Sergeant Scott: The short answer is: I was ordered to. We were fighting a PR war back home. The government needed a face - a living face - to parade around to solicit support for an unpopular war. I was chosen. Rossi: And Hernandez? Sergeant Scott: He was paying a debt. He was being a Marine. He died so that we could live. Rossi: And you couldn't tell anyone.