"Master Kalyna and Instructor Duncan have a breadth and depth of operational experience in both uniform and plain-clothes that very few others can claim. These men have tested their craft, not in a dojo, ring, or cage, but in combat and undercover work where weapons and death are present."

"I have trained in martial arts from various cultures since the early 1980s, and have 18 years’ experience in security and policing. As an assaulter on a busy urban SWAT unit, I trust my close quarter training to very few. These two Combat Sambists have earned my respect and attention."

TC#14, Black belts in Brazilian Jiu-jitsu and Goju Ryu Karate.

"I have known Instructor Duncan throughout his martial arts journey and policing career. It is rare to find someone as highly ranked in martial arts as Duncan who is humble enough to, as Bruce Lee said, "Reject what is Useless and Absorb what is Useful".

"Unfortunately, many defensive tactics and martial arts instructors teach what works only in theory. As his former martial arts instructor, I can attest that he is continually developing what he teaches and testing it to ensure it works in the real world so that officers can come home safely after their shifts."

• Former National Coordinator, Use of Force, Correctional Service of Canada.
• Former Criminology Professor, Police Foundations, Algonquin College.
• Author of "The Thinking Officer's Guide to Police Defensive Tactics"
• Certified instructor in Karate, Jiu-Jitsu, Muay Thai, Filipino Martial Arts, Jun Fan Gung Fu/Jeet Kune Do Concepts, FAST Combatives, and Shamrock Fighting Systems
• Graduate of U.S Dept. of Homelands Security's Federal Law Enforcement Training Centre's Defensive Tactics Instructor-Trainer Program.
• 2017 World Police and Fire Games Karate Champion.

"I’ve had the opportunity to train with Instructor Duncan weekly and found his teachings to not only be practical to real life situations but effective in every regard. I’ve trained extensively in numerous martial arts throughout my life, and have trained to compete".

"I discovered through my martial arts journey that there is a definitive difference between competing in sport, and training to survive a potential life and death situation."

"Combat Sambo has built the bridge between sport fighting and real life (hands on) self-defence."

"Instructor Duncan has developed my confidence in disarming and dealing with situations regarding firearms and/or edged weapons in training, situations that I couldn’t have even imagined dealing with prior to his tutelage."

"My mind was officially blown when I started his classes, and can’t seem to get enough. I look forward to continuing my close quarter training under his direction."

• Brazilian Jiu Jitsu (BJJ) Worlds – Silver and Bronze medalist.
• BJJ Pan American - Bronze medalist.
• Canadian Abu Dhabi Pro Trials (qualifier) – Gold (Heavyweight) and Silver medalist (Super Heavyweight).
• Canadian Heavyweight representative for Abu Dhabi Pro BJJ – Abu Dhabi BJJ competitor for Canada.
• BJJ Grapplers Quest – Silver Medalist.
• X2 Joslin’s BJJ Open– Gold Medalist.
• BJJ Ontario Open – Open Weight Champion Gold (Representative of Canada for Worlds).
• New York City International (IBJJF) Open – Gold medalist.
• Virginia BJJ Open – Gold medalist.
• California Open – Gold Medalist.
• In house Nova Unaio Open across Ontario - Champion.
• Niagara Heavyweight Boxing – Gold.
• Cabbagetown Boxing Tournament – X2 Gold.
• St.Catherines Boxing Tournament – Gold.
• Uniformed Police Officer for over 10 years.