Section 2(15)(c) in The Coimbatore City Municipal Corporation Service Rules, 1987
(c)whole-time duty in-(i)the Civil Pioneer Force, the Madras Civil Labour Units or the Madras Labour Units for Ceylon; or(ii)the A. R. P. or any other Civil Defence Organisation specified by the Central Government; or(iii)any post created for the efficient prosecution of the war of 1939-1946 or associated with the training of war technicians, if duty in such post is declared by the Central Government to be military duty.