The heart of leadership, especially within the profession of arms, is summarized with a single word: influence. Influence is the ability to have an effect on the character, development, or behavior of someone or something. As leaders, we must begin by first and foremost understanding this fundamental principle. People can be influenced one of two ways: through mandate leadership or through organic leadership. Understanding these two very different approaches to influence will in large measure determine not only what type of leader we are, but also the effectiveness of our leadership in shaping the behavior of others.