The content of the website is protected by international copyright and owned by Fairbairn Sykes. The World War II Defendu Video Pack Includes: Fairbairns Defendu On Demand Video 96. The content of the website is protected by international copyright and owned by Fairbairn Sykes. Defendu Fighting System-Sykes-Fairbairn Commando knife Not all. All other NFL-related trademarks are trademarks of the National Football League. Fairbairn Sykes Limited is a registered limited company in the United Kingdom with company number 12222519 holding registered trademark number UK00003249389. Fairbairn Sykes® Limited is a registered limited company in the United Kingdom with company number 12222519 holding registered trademark number UK00003249389. There were differences between the police and military systems, but I think asking if WWII troops ever used Defendu is really just a semantic argument.
NFL and the NFL shield design are registered trademarks of the National Football League.The team names, logos and uniform designs are registered trademarks of the teams indicated. Many people seem to use 'Defendu' to specify Fairbairn's police system, as opposed to Fairbairn's military system.