Having fast hands and quick feet are just a few of the skill sets boxers need to possess to survive in the ring.
This month, sports fans are eagerly anticipating the much-talked-about Mayweather versus McGregor fight, so check out our list of men who went from serving their country, to "duking-it-out" in the ring.
1. Joe Louis
During the early 1940s, Louis reportedly joined the Army after fighting in a Navy charity bout and was assigned to a segregated cavalry. He served proudly for the next fours years and earned himself the Legion of Merit medal for exceptionally meritorious conduct.
Nicknamed the "Brown Bomber," Louis began professionally competing in the heavyweight class in 1934 and retired in 1951 with a winning record of 66-3.
Louis receiving a medal for his service by a senior officer.
2. Jack Dempsey
Fighting under the name "Kid Blackie" and "The Manassa Mauler," Dempsey began his professional boxing career in 1914. During WWII, Dempsey joined the New York State National Guard before serving in the Coast Guard where he retired in 1953 reaching the rank of commander.
Dempsey as he trains.
3. Ken Norton Sr.
Norton joined the Marine Corps in 1963 where he began to develop his boxing skills. Shortly after his discharge in 1967, Norton turned pro and started fighting elite boxers like Muhammed Ali. He retired in the early '80s with the outstanding winning record of 42-7.
Muhammad Ali (right) winces as Ken Norton (left) hits him with a left to the head during their re-match at the Forum in Inglewood. (AP Photo/File)
4. Rocky Marciano
Marciano was drafted into the Army in 1943 and discovered his boxing talent while stationed at Fort Lewis, Washington. In 1946, he dominated an amateur armed forces boxing tournament taking first place. After a brief hiatus to pursue a baseball career, Marciano eventually returned to boxing where he began racking up knock outs.
He retired in 1956 with an undisputed fighting record of 49-0.
Marciano punching the heavy bag.
5. Leon Spinks
Spinks joined the Marine Corps in 1973, giving him an opportunity to develop his boxing skills. Spinks fought in the 1976 Olympic games in Montreal and squared off with the legendary Muhammed Ali who he beat after fighting for 15 brutal rounds.
Spinks retired from the sport of boxing in the mid-'90s with the record of 26-17.
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6. Jamel Herring
Nicknamed "Semper Fi," Herring began his boxing training in the early 2000s before enlisting in the Marine Corps where he served two tours in Iraq. During his time in the Marines, Herring found himself on the All Marine Corps boxing team and competing on the national stage.
As of July 2017, Herring has the distinguished record of 16-1 and plans to compete for years to come.
Jamel Herring, a Marine veteran poses for a photo with former teammate Sgt. Todd DeKinderen. (Photo by Sgt. Caleb Gomez)