The repatriation of remains of US soldiers missing in the 1950-53 conflict is seen as a modest diplomatic coup for US President Donald Trump.
The Rohingya representative, Mohibullah, was held in Cox's Bazar district as local authorities broke up a protest on Monday against the controversial repatriation deal signed by Bangladesh and Myanmar.
Bangladesh Foreign Minister A H Mahmood Ali insisted that the operation to return some 750,000 refugees who fled unrest and a military crackdown in Myanmar would involve the UN's refugee agency.
At a meeting in Myanmar's capital Naypyitaw, the countries signed two agreements covering security and border cooperation.
The remains of 33 Australian soldiers killed during the Vietnam War and buried in Malaysia and Singapore returned to rest in Australia on Thursday, in one of the country's largest single repatriation operations.
A new office has been opened for simplifying procedures for the repatriation of the bodies of expatriates who die in Qatar and also for their local burial, if required.