The Constitution provides for the creation of All India Services (AIS) common to the Union and the States. The All India Services Act, 1951 provides that the Central Government may make rules for regulating the recruitment and the conditions of service of persons appointed to the All India Services. Presently only the IAS, the IPS and the IFS have been constituted as All India Services. Recruitment to these services is made under the corresponding AIS Recruitment Rules and may be done by Direct Recruitment (through Competitive Examinations) and by promotion from the State Service . The AIS Branch is concerned with the latter mode of recruitment which is governed by the respective IAS/IPS/IFS Promotion Regulations.