With most troops learning hand-to-hand combat in the military, it's not surprising that some would end up getting really good at it.
UFC legend Randy Couture is a former 101st Airborne Division soldier, while Brian Stann was a decorated Marine Corps platoon commander before entering the Octagon. As it turns out, veterans have a history of fighting in the Ultimate Fighting Championship.
Here are four of them:
1. Neil Magny
Neil Magny has a 16-5-0 record now, but he first learned hand-to-hand fighting as a light-wheeled mechanic in the Illinois National Guard. He credits the same discipline that got him through Army training as being what propels him in the UFC. He won five fights in 2014, tying the record for most wins in a single calendar year previously set by Roger Huerta in 2007.
His combatives team in the National Guard expressed regret when he left the Guard to focus on his MMA career, but encouraged him to pursue his dreams.
2. Liz Carmouche
Former Marine Sgt. Liz Carmouche has a 10-5-0 record in mixed martial arts and famously fought Ronda Rousey for the Women's Bantamweight title in 2013. Rousey admitted before the fight that fighting Carmouche would be different.
"She's a Marine, I'm not going to be able to intimidate this girl," Rousey said in an MMAFighting.com interview. "The prefight intimidation stuff won't work."
Carmouche was recently scheduled to fight but was sidelined by injuries.
3. Colton Smith
Staff Sgt. Colton Smith is one of only a handful of soldier-athletes to compete in the UFC while serving on Active Duty. He recently reenlisted for an additional four years in the Army and holds a 6-4-0 record in mixed martial arts.
The Ranger and Sapper-qualified infantryman currently serves as a combatives instructor in Fort Hood, Texas, but has said he's interested in a special operations assignment soon.
4. Tim Kennedy
Like Colton Smith, Tim Kennedy began his UFC career while on active duty. The Ranger-tabbed Green Beret was a sniper before he transitioned from active duty to the Texas National Guard to focus on his MMA career. He currently serves as a Special Forces Weapons Sergeant, and holds an 18-5-0 record in mixed martial arts.
While Kennedy is still a UFC athlete, he has stated that it would take a "special" fight for him to make another appearance due to his frustrations with cheating in the sport.