Larry Warren, who used the pseudonym Art Wallace, was a member of the US Air Force Security Police stationed at an American base on British soil. He is most famously known for his involvement in the Rendlesham Forest Incident and has published a book on this event co-authored with Peter Robbins.
He claims that he was taken from his guard post to investigate strange lights in a forest clearing near the base. Here he and other enlisted men and officers apparently confronted an alien craft on the ground. in addition, the base deputy commander has come forward to verify some of the details in this case; this has led to its being called "the British Roswell" - one of the most talked about UFO cases of recent times.