Major General Datta started his career in uniform when he was commissioned in the 2nd Battalion of the 1st Gorkha Rifles in March 1970.

One of Datta's major accomplishments was the designing and introduction of the bullet-proof patka for the army and para-military forces.

He also designed and conceptualised the bullet-proof jacket (kavach) which is being produced by DRDO.

He was involved in the raising of the Special Protection Group and the National Security Guard.

He was also posted as the chief of staff of 21 Corps (offensive formation of the Indian Army).