We all write that final letter to loved ones when we start a tour of combat duty, hoping that it will never be opened. For most of us it isnt and we rip it up when we return. For others, it is the last thing a mother will hear from her son. Rifleman Cyrus Thatcher was one of the unlucky ones. He was nineteen when he was killed by a bomb in Afghanistan seven weeks ago. His mother has released the letter to a British newspaper. Following are the words of a proud soldier and a young son. Rest in peace Cyrus. You shall not be forgotten. Condolences to his family.