Missions have changed over the years, but what has remained constant since November 10, 1775 is our unyielding commitment to protecting the lives of our citizens and the interests of our nation. Our purpose, by congressional mandate, is to be this nation's rapid response force; we are thus called to be "most ready when the nation is least ready." From humanitarian relief efforts to combat operations; from air, land and sea to every clime and place, the Marine Corps is ready to answer our nation's call.