Based on their respective beret colors and badges, Kovax, Lucas, Victor and Marius are all "Commandos Marine" of the French Navy, while Elias is most likely from the "No. 10 Air Parachute Commando" unit of the French Air Force and Tic-Tac is a Commando from the French Army's "1st Marine Infantry Parachute Regiment". France's Special Operations Command (COS) has direct operational command of all special operation units, and thus are able to select members from different branches based on mission needs.
Marius is played by Alain Alivon, a real French military and drill instructor member of the Commandos Marine unit and the French Navy. He was a Commando, then drill instructor for the Commandos, for 22 years. Similar to R. Lee Ermey's role in Full Metal Jacket (1987), this role reflects Alivon's prior military career.