Alain Alivon, known under the pseudonym Marius (born 23 July 1965 in Marseille), is a French military and drill instructor member of the Commandos Marine unit and the French Navy. He is mostly known for featuring in the 2005 documentary L'École des bérets verts on France 2 in the program Envoyé spécial. He later appeared on film and television, and publishing his autobiography.