I was visiting her excellent website and found this latest article on the Bentwaters/Rendlesham Forest UFO incident of December, 1980.
In this article, Staff Sgt James W. Penniston provided a sketch of the triangle craft he saw, photographed, and touch. He also produced a sketch of some writing that he found on the craft as well. The symbols were 3 inches high he said.
Check it out with the link below.
REf. Earthfiles.com, "Former RAF Bentwaters Staff Sgt. James Penniston recalls Black, Glassy, Triangular Craft, Symbols and Missing Time." by Linda Moulton Howe. (http://www.earthfiles.com/news.php?ID=1618&category=Environment).