At age 11, after the death of his father, the incumbent village chief, he travelled to Phnom Penh with his older brother to finish his studies.

As a result, Vong ascended to the rank of Admiral of the fleet and replaced former superior Pierre Coedes as the head of the Naval forces.

According to a declassified CIA report from 14 August 1970, a secret council named "The Revolutionary Committee" staged and planned the coup that led to the removal of Prince Sihanouk from power and to the creation of the Khmer Republic.

[3] On 12 April 1975, United States operation Eagle Pull evacuated all remaining U.S citizens from besieged Phnom Penh as well as acting president Saukham Khoy.

Following his departure, a supreme committee, consisting of Sarendy Vong and six other high placing officials, was formed to govern the republic.

Vong's headquarters in the Chroy Changvar peninsula were encircled and a final phone call to head of state Sak Sutsakhan confirmed the dissolution of the supreme committee.