MANDALAY (Reuters) - The United States on Tuesday retrieved the possible remains of service members who went missing in Myanmar during the Second World War, marking the first such mission to Myanmar carried out by U.S. military aircraft, American officials said.

Remains discovered during a recent recovery mission in Myanmar and believed to belong to U.S. service members missing from World War Two are prepared to be transported back to the Defence POW/MIA Accounting Agency (DPAA) Laboratory in Hawaii, U.S., in Mandalay, Myanmar, March 12, 2019. REUTERS/Shoon Naing

After a brief ceremony, the remains were taken from Myanmar’s second-largest city, Mandalay, to a laboratory in the United States for further analysis and identification.

“We remember. You are not forgotten,” said the U.S. ambassador to Myanmar, Scot Marciel, at the ceremony. He said the mission was meant to honor the memory of the fallen service members and to show appreciation for their service.

From 1942 to 1945, the airspace over Myanmar, then called Burma, served as an important supply corridor from India to China after the Japanese captured the northern town of Lashio, severing the last major Allied supply route over land into China.

During the period, American transport planes made daily flights over the eastern Himalayas, a perilous route called the Hump, according to the website of the U.S. embassy in China.

The remains are believed to be from a B-25G aircraft with seven crew members onboard that crashed in February 1944 in Myanmar’s northwestern Sagain region, U.S. officials said.

More than 82,000 Americans remain missing from past conflicts, and 632 U.S. service members, mostly air crews, disappeared in Myanmar during World War Two, U.S. government data show.

Relations between the two countries have chilled after Washington last year sanctioned some Myanmar military and police commanders and army units, accusing them of ethnic cleansing against the Rohingya Muslim minority.

Myanmar has rejected the charges, saying it was fighting Rohingya “terrorists”.

About 730,000 Rohingya fled Myanmar after August 2017 following what a U.S. government investigation described as a “well-planned and coordinated” campaign of mass killings, gang rapes and other atrocities against the Rohingya by the Myanmar military.