[3] Customarily held by a four-star general officer, the COAS is the senior-most operational officer of the IA, tasked with the roles of overseeing the overall functioning of the force during peace and wartime, committing to the preparation and maintenance of the force's operational effectiveness and defending the nation's territorial integrity and sovereignty.

[6] Seated at the Integrated Headquarters of Ministry of Defence (Army) (IHQ of MoD (Army)), stationed in New Delhi, the COAS is the senior-most operational officer of the IA, and is tasked with the following: In addition to these responsibilities, the COAS is also a permanent member of: The office's eminence in the aforementioned groups thus grants the appointee with the role to advise the Minister of Defence (Raksha Mantri or RM) on the affairs related to the IA's functioning and the promotion of an comprehensive integrated planning policy with respect to the affairs of tri-service integration, doctrinal strategy, capability development, defence acquisition and infrastructure.

[15] The move to appoint a new designate to the position usually begins three months before the change-of-command, wherein the Ministry of Defence (MoD) reviews the résumés of the IA's sole Vice Chief of Army Staff (VCOAS) and five General Officer Commanding-in-Chiefs (of the force's five combatant commands) - all of whom are lieutenant generals, before making a decision.

[19] According to the IA's Army Rules, 1954 - a COAS-appointee reaches superannuation upon the completion of three years in the position or at the age of 62, whichever is earlier.

[20] However, an appointee may also be dismissed from office by the President of India before the conclusion of the tenure under Section 18-19 of the Army Act, 1950 and Article 310 of the Constitution.

In 1895, the three armies were merged to form a unified British Indian Army (BIA), under the direct control of the C-in-C.[28] Following the Kitchener Reforms in 1903, up until the establishment of India's independence in 1947, the C-in-C functioned as the supreme commander of the armed forces in the subcontinent, liaising directly with the Governor-General of India over the administrative affairs of the stationed military.

[31] Three lieutenant-generals were shortlisted as candidates for the position, namely: Ultimately, Cariappa was chosen to succeed Bucher, which he did on 15 January 1949, with the substantive rank of a four-star general - which thus made him the first Indian-origin general and first native chief of the Indian Army; the day of his appointment has been commemorated annually ever since as Army Day.