Question

Who ordered the surrender of Japan? (The original question had an unrecoverable list of Allied Commanders)

Answer 1

Japanese Emperor Hirohito

Explanation:

It was more complex than just ordering the surrender. It was a long
difficult job. It is worth watching of reading the book movie about the day before the Emperor's speech was broadcast. It includes pro war troops overrunning the Palace and killing many of the Imperial guard and trashing the interior of the palace looking for the recording.

"Japan's Longest Day" was a book, a movie (1967) and another movie (2014) all are pretty good and are not too messed up by Japanese revisionism.

Answer 2

If you must select the answer from above, Douglas MacArthur and Chester Nimitz will be the answer.

Explanation:

The Potsdam Declaration was issued by Harry S. Truman(United States), Clement Attlee(United Kingdom) and Chiang Kai-shek(China) on July 26,1945.
https://en.wikipedia.org/wiki/Potsdam_Declaration
http://www.ndl.go.jp/constitution/e/etc/c06.html

However, Japan refused to sign the declaration then. After two atomic bombs were dropped over Hiroshima(August 6, 1945) and Nagasaki(August 9, 1945), Japan finally agreed to surrender and the war ended on August 15,1945.

On September 2, 1945, the Japansese Instrument of Surrender was signed by Mamoru Shigemitsu, Yoshijiro Umezu(Japan), Douglas MacArthur, Chester Nimitz(US) and other reperesentatives from China, United Kingdom, Soviet Union, Australia, Canada, France, Netherlands and New Zealand.

https://en.wikipedia.org/wiki/Japanese_Instrument_of_Surrender
https://www.archivesfoundation.org/documents/japanese-instrument-surrender-1945/