Why is Army Day celebrated in India on January 15 every year?

Army Day is celebrated in India on January 15 to commemorate the occasion when General KM Cariappa took over the command of the Indian Army in 1949, becoming the first Army chief of independent India. General Cariappa took over from the last British Commander-in-Chief in India, General Sir FRR Bucher. The Army Day parade was held in Bengaluru this year.