Answer : 2. "15 January"
Explanation :

Indian Army Day is celebrated every year on 15 January across the country. This day was established in 1949 by the first Indian Chief of the Indian Army, General K.M. It is celebrated to mark the anniversary of Cariappa's appointment. The theme of Indian Army Day in the year 2024 is "In Service of the Nation". Presently the Chief of the Indian Army is General Manoj Pandey.