Radhakrishna deals with the three Services’ i.e. Army, Air Force, Navy and Coast Guard. It also deals with the Inter – Services Organization. It is also responsible for the Defence Budget, Establishment Matters, Defence Policy, Matters Relating To Parliament, Defense Co-Operation with foreign countries, and Co-Ordination of all defence related activities. It is headed by Defence Secretary who is assisted by the Director General (Acquisition), Additional Secretaries and Joint Secretaries. Defence Secretary is also responsible for coordinating the activities of the other Departments i.e DDP, DESW and DRDO in Ministry of Defence.