Logistics make it possible for military units to be ready to fight, and have the materials to conduct and sustain the fight. Sometimes, in very informal military discussions, someone will offer a toast: "Amateurs talk tactics. Dilettantes talk strategy. Professionals talk logistics." Obviously, the toast was offered by someone with a bias toward logistics, but there is much truth to it. Strategy determines why to fight, the form of one's forces, and where to fight. Tactics defines how the fight is conducted once begun.