Meical evacuation — often termed MEDEVAC or medivac — is the timely and efficient movement and en route care provided by medical personnel to the wounded being evacuated from the battlefield, or to injured patients being evacuated from the scene of an accident, to receiving medical facilities (hospitals), using medically equipped ground vehicles (ambulances) or aircraft (air ambulances). Examples include civilian EMT vehicles, civilian aeromedical helicopter services, and Army air ambulances. This term also covers the transfer of patients from the battlefield to a treatment facility or from one treatment facility to another by medical personnel, such as from a Navy ship to a shore-based Naval hospital.