"one of the Three Musketeers"
The Three Musketeers is a novel written by Alexander Dumas, set in the seventeenth century in France. The musketeers were the private guard of the king of France, Louis XIII. The book follows the adventures of D'Artagnan, who leaves home to become a musketeer. The musketeers in the title refer to Athos, Porthos and Aramis, who live by the slogan "all for one, one for all".
A musketeer in uniform
Good films about musketeers include: The Musketeer (2001) starring Justin Chambers and Tim Roth; and The Man in the Iron Mask (1998), starring Leonardo DiCaprio, Gabriel Byrne, John Malcovich, Gérard Depardieu and Jeremy Irons.