Ｌｅａｖｅ Ｎｏ Ｓｕｒｖｉｖｏｒｓ Ａｌｉｖｅ

A soldier who seeks strength, Mercenary Aces leaves no target on the battlefield alive, whether it's defenseless or not. All you must do is destroy all (if not, most) targets as possible on the map before going after the main objective. Completing your objectives and destroying many targets as possible will earn you the Mercenary Style. It's simple as it sounds; doing it this way makes soldier seem more savage.