The Mustin, which is commanded by an American-Cambodian, arrived in Preah Sihanouk province, for a five-day visit.
Cambodia and Thailand will celebrate 60 years of diplomatic relations on Dec. 19.
Chan Serey, a 37-year-old soldier, lost all four of his family on Nov. 22.
Cambodia has been a full member of the UN since 1955.
But a government committee said the bridge disaster was not the fault of any body or agency.
Ou Virak, president of the center, said the victims have the right “to find out the facts” of the incident.
Siegried Blunk, of Germany, will replace Marcel Lemond, who resigned in September.
The group also found financial ties between individuals in government and businesses responsible for rights violations.
Ninety-five political leaders from 44 Asia and Pacific nations met in Phnom Penh on Thursday to strengthen their role in the region.
Family members will receive up to $12,000 each from different organizations, the government, the owners of Diamond Island, and others.