7th Heaven S06E20 - The Known Soldier

Annie discovers Ruthie is writing to a Marine fighting in Afghanistan as part of a school project. The Camden family read what Ruthie has written to her pen pal about their lives and in turn learn about a Marine who so bravely has left his wife and son to fight in the war against terror. When Ruthie fails to get a response email at school and Eric hears about a helicopter going down killing two people he contacts the Colonel.