Only the Spy can wear high rank uniforms, although no matter what rank he is dressed in, anyone above the rank of officer will immidiately recognize him. In the case of Commandos: Behind Enemy Lines the Spy can't choose the rank he is dressed in, but in the sequels the player must be aiming to kill a high rank enemy officer instead of an ordinary soldier. To use it, click on the Uniiform icon or press the Hotkey U to dress and undress the uniform.