Ajit Singh was one of the squad commanders of 3 Troops of Alfa Assault Team 10 Para Commando. On 28 August 1989, Number 3 Troop located at Alampil (Sri Lanka) was tasked to carry out a search-and-destroy mission along road Alampil Mullaitivu. The Troop Commander of Number 3 Troop deployed Havildar Ajit Singh's squad with a rocket launcher on the flank to cover the movement of the Troop. As soon as the Troop resumed its move, it came under fire of small arms and rockets. Havildar Ajit Singh realising that the Troop had been ambushed by the militants, returned thc fire. However, assessing that the strength and position of the militants was formidable, he decided to encircle them. Havildar Ajit Singh deployed his squad on the flank and brought down continuous and effective fire on the militants. This threat on the flank diverted the attention of the militants and reduced the weight of fire on the remainder of the Troop. In the ensuing exchange of fire a rocket launcher detachment paratrooper was wounded and a rocket launcher detachment commander was killed. Havildar Ajit Singh himself picked up the rocket launcher and commenced firing. In the process he also received a bullet in the chest and died on the spot. 

Havildar Ajit Singh, thus, displayed leadership qualities, conspicuous courage and valour in action and made the supreme sacrifice in the highest tradition of the Army.