The product is a paperback book titled "GUERRILLA WARFARE AND SPECIAL FORCES OPERATIONS, FM 31-21, 1961" authored by the US Army. Published by MILITARIAPRESS in English, this book falls under the genre of War & Combat and focuses on warfare tactics. The book likely covers various strategies and techniques used in guerrilla warfare and special forces operations, providing valuable insights for military personnel and enthusiasts interested in this area of warfare.