Central Government Act
Section 22(1) in The National Service Act, 1972
(1) The Central Government may, if it is satisfied at any times that by reason of the gravity of the situation it is necessary so to do, by order-
cancel, either generally or in relation to a specified class of qualified persons, all postponement certificates in force at the date of the order, and
abrogate, either generally or in relation to a specified class of qualified persons, any right to apply for the grant of a postponement certificate and any right to appeal from the refusal to grant such a certificate, and may, by order, vary or revoke any order in force under this section, without prejudice however to the previous effect of that order.