In 1951, Hai graduated from the Dalat Military Academy, Class 7.
In 1968, he was commanding the Ranger Branch Command, directly supervising the Ranger's raid to clear the enemy force that infiltrated into the business quarter of Cho Lon area. He was then assigned National Police Chief.
He was the commander of the 7th Infantry Division at Dong Tam, near My Tho.
In 1970, he was commander, Special Tactical Area 44, before commanding the 7th Division. He was renowned for being incorruptible, outspoken and brave. He won the adoration of everyone who once worked with him.
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