Randhir Sinh was commissioned into the 4th Battalion 3 Gorkha Rifles. He has studied the apex course at the Royal College of Defence Studies in the UK and has held prestigious staff and instructional appointments. Maj. Gen. Sinh has taken part in counter insurgency operations in the northeast, Punjab and Jammu and Kashmir. He has served length of the Himalayas, including commanding the brigade in Siachen. He also commanded the division along the Line of Control, south of Pir Panjal. He is the recipient of four gallantry and distinguished service awards and held the Chattrapati Shivaji Chair of Excellence at the USI.