I just saw "Mr Soft Touch" with Glen Ford which is a bizarre blend of noir crime and Capraesque comedy. And I found in this Man-trap another strange mix of political noir, friendship between 2 soldiers from Korea, and melodrama in Hunter's life with a boozy Stella Steven's. That blend of genres send the viewers in all directions. So it's certainly not a pure noir for me.
This is the last movie directed by cult noir actor Edmond O'Brien, after 2 tvs and "Shield for murder" (co directed with Howard Koch). In this Man-trap, there is a scene in which Jansen disguises in a South American vip and raises his voice, well it recalled me "the Third Voice" directed one year later by Hubert Cornfield, Edmond O'Brien plays the Voice speaking loudly, quite nice tough film noir.