No officer of the Indian Navy has yet been conferred this rank.[88] The CNS is assisted by the Vice Chief of Naval Staff (VCNS), a vice-admiral; the CNS also heads the Integrated Headquarters (IHQ) of the Ministry of Defence (Navy), based in New Delhi. The Deputy Chief of Naval Staff (DCNS), a vice-admiral, is a Principal Staff Officer, along with the Chief of Personnel (COP) and the Chief of Materiel (COM), both of whom are also vice-admirals.[87] The Director General Medical Services (Navy) is a Surgeon Vice-Admiral, heads the medical services of the Indian Navy.[89]