[From Luc Moullet’s Politique des acteurs (1993, Cahiers du cinéma). See Table of Contents]

The saga of the left profile: Cooper has to always have the most marked face possible… (Sergeant York, 1941)
Gary Cooper became famous, most of all, in uniform: thirty of his eighty-two films present him in attire, starting from Opus 5, Wings (1927), till the penultimate one, The Wreck of the Mary Deare (1959), and we must perhaps also include For Whom the Bell Tolls, where he is in plainclothes but at war. He stands, then, for the conventional, official Right, somewhat perverted towards the end of his career since, in the comedy You’re in the Navy Now (1951), he plays an officer holding a post that has nothing to do with his capabilities, since The Court Martial of Billy Mitchell (1955) shows him as an outcast general criticizing the decisions of the army. And the captain of the Mary Deare, the only man on board the ghost ship that traffics arms, would also go on trial, just like Billy Mitchell.
But more than a moral value, the uniform represents a visual asset: it throws Cooper’s great height into relief. His lean build makes him look almost like a model. All outfits go on him: army, navy, air force, ancient (in Westerns) or exotic (attire of the French legionnaires) uniforms, or both at once (The Lives of Bengal Lancer).
Morocco (1930) is not the first film where he is a legionnaire (there was Beau Sabreur already in 1928), but it’s the one that imposed this brand image. Undoubtedly, the success of Morocco incited lazy producers to cast him as an army man in five consecutive films from 1931 to 1933.
Watching Sternberg’s Morocco, we could say that Cooper is more of a silhouette, a statue, an image, a model, a prop, an element in the general aesthetic of the film. He belongs to the class of Sternbergian strongmen, the giant variety (like John Wayne later) that alternates with the stout variety (Bancroft, Jannings, McLaglen, Beery, Mature), the Mitchum of Macao being both — a predilection that might explain the failure of Crime and Punishment, Raskolnikov-Peter Lorre being evidently the antithesis of the Sternbergian man.
This mythical aspect goes hand in hand with the spirit of the film. You get the feeling that Sternberg—in this film as in his other works of the period—accepted and even sought out all the already-mythologized elements of convention—a handsome army man, a femme fatale, an impossible love, a rich and wily old French seducer, and the charms and the dangers of mysterious Africa. This strategy allowed him to come out of all charges unscathed: if the film failed, wise guy Sternberg could always claim that it was impossible to make anything from such a ridiculous plot. If the film succeeded, he could boast of having overcome all these superhuman obstacles.