The Sopwith Pup was one of the most famous World War I fighters. It is remembered as being one of the best flying aircraft of W.W.I, a tribute to T.O.M. Sopwith design philosophy of a simple and aerodynamically clean structure. Pilots who flew this aircraft apparently looked upon it as an offspring of the 1-1/2 Strutter and dubbed it as the "Pup". It's little known official name is the Sopwith Type 9901.