 The Ministry of Defence consists of five Departments; Department of Defence (DoD), Department of Military Affairs (DMA), Department of Defence Production (DDP), Department of Defence Research and Development (DRDO), and Department of Ex-Servicemen Welfare (DESW).The Defence Secretary of India functions as head of the Department of Defence, and is additionally responsible for coordinating the activities of the Departments in the Ministry.The principal functions of all the Departments are as follows