It has various active roles during an outbreak of war. CAPF facilitates a navy, air wing and an artillery regiment. It is under the control of the Ministry of Home Affairs. However, the BSF has a small force of officers or "Cadre". Notably, the head designated Director-General (DG), has been an Indian Police Service officer since its establishment.[6] The BSF has grown from 25 battalions in 1965, to 192 battalions with a sanctioned strength of 270,000 personnel including an expanding air wing, navy, an artillery regiment and specialised units.[7][8] It is currently the world's largest border security force. BSF has been termed the First Line of Defence of Indian territories.[9]