He is a veteran NCR soldier, currently holding the rank of Major. He was also at Bitter Springs, and was a captain at the time. He's currently in charge of NCR Ranger troops at Camp McCarran. He's the adoptive father of Sgt. Bitter-Root. He has a strong disgust for the Fiends and also the Great Khans (the latter to a lesser degree).
He's currently in charge of the bounties at Camp McCarran and will pay handsomely for the heads of three Fiends.
Three-Card Bounty: Dhatri wants the player to kill three Fiend leaders and take their heads to him, for which he will pay a handsome reward, but he's very particular about the means of their deaths - no headshots or decapitations.
pc After killing Driver Nephi in "Three-Card Bounty" Major Dhatri may be dead upon returning to Camp McCarran making the quest unable to be completed. It appears Dhatri may have taken friendly fire bullets and died near the firing range. [verified]
xbox360 After killing Caesar and his legionaries at The Fort if you then fast travel to Camp McCarran Dhatri may show up as an enemy on the compass, causing your companions to shoot at him. [verified]
ps3 Sometimes Dhatri is nowhere to be found and may be glitched out of the world. [verified]