Following a meeting with historians of Thanet’s military past, an assessment has begun of the available documentary sources to support a possible new project for an enhanced study of the defences of this council district. This would continue Kent County Council’s Defence of Kent Project which aims to better understand the role, evolution, distribution and survival of the county’s varied military and civil defence structures, built or used during the 20th century. It is hoped to bring this subject more fully into the public domain, providing greater awareness by publication, educational and interpretational projects, by highlighting sites for protection or conservation as well as by improving physical access. Four districts have already been studied, with a fifth well underway, Thanet being the sixth. Thanet already has a strong showing of knowledgeable military historians who have contributed substantially and expertly to what we know about defence sites on the island and a review of records for the island has begun to suggest the potential for further significant discoveries. It is hoped that existing historians supported by others from the community might take forward the process of discovery. From this it will be possible to complete a more full understanding of the anatomy and function of Thanet’s triad of land, air and sea defences throughout the whole of the period from 1900 until the Cold War. Special attention will be given to studying the historical evolution of the infrastructure of Manston airfield. Recommended reading is Ron Stilwell’s The Defence of Thanet and East Kent (1939-1945), published by the author in 2014. It contains 197 pages and is profusely illustrated.