(c)"invalid pension" means pension awarded on retirement from the [Zila Panchayat] [Substituted by U. P. Act No. 9 of 1994.] service to an officer who by bodily or mental infirmity is permanently incapacitated for the [Zila Panchayat] [Substituted by U. P. Act No. 9 of 1994.] service or for the particular branch of it to which he belongs;