[14][15][16][17] On 11 December 2021, he set up a 400 litres of oxygen per minute oxygen generation plant, at the base hospital in Bengdubi near Bagdogra in Siliguri[18] On 16 May 2022, Lt Gen Tarun Kumar Aich, the GOC of Trishakti Corps, and Avinash Khare, the VC of Sikkim University signed the MoU for the Eastern Command Tibetology cadre course (ECTCC).

It is first of its kind radar in India installed jointly by the Indian Army and Defence Geoinformatics and Research Establishment (DGRE) located at an altitude of 15,000 feet.

[20] After relinquishing the command of Trishakti Corps, he moved to the Army headquarters and assumed the appointment of Director General Military Intelligence.

On 14 March 2023, he assumed the appointment as the 4th and the current Deputy Chief of the Army Staff (Strategy) succeeding Lt Gen M. V. Suchindra Kumar.

[2] 1 April 2013 (substantive, with seniority from 10 June 2011)[29] Media related to Tarun Kumar Aich at Wikimedia Commons