Constitution of India , Art.309, Art.16(4)— Administrative Service (Cadre) Rules (1954) , R.5— Cadre allocation - Govt. letter dt. 31-5-1985 - Cl. 2 of it gives preference to SC/ST candidate for allocation to his home State - It does not provide reservation of appointments or Posts - Said principles need not be tested on anvil of Art. 16(4). When a person is appointed to an All India Service, having various State Cadres, he has no right to claim allocation to a State of his choice or to his home State. The Central @page-SC15 Government is under no legal obligation to have options or even preference from the officer concerned. Rule 5 of the Cadre Rules makes the Central Government the sole authority to allocate the members of the service to various cadres. It is not obligatory for the Central Government to frame rules / regulations or otherwise notify "the principles of allocation" adopted by the Government as a policy. The letter dated May 31, 1985 shows that the Central Government has always been having guidelines either in the shape of "limited zonal preferences system" or "Roster System" for the exercise of its discretion under Rule 5 of the Cadre Rules. Simply because the principles of allocation called "Roster System" were not notified, it is no ground to hold that the same are non est and the Central Government cannot foll....