To “reverse course” means a person or organization changes their position or opinion so that it's the opposite of what they said before.
The Reverse Course (逆コース, gyaku kōsu) is the name commonly given to a shift in the policies of the U.S. government and the U.S.-led Allied Occupation of Japan as they sought to reform and rebuild Japan after World War II. The Reverse Course began in 1947, at a time of rising Cold War tensions.
The Allies punished Japan for its past militarism and expansion by convening war crimes trials in Tokyo. At the same time, SCAP dismantled the Japanese Army and banned former military officers from taking roles of political leadership in the new government.
The Allied Occupation of Japan (連合国占領下の日本, Rengōkoku senryō-ka no Nihon) was a military occupation of Japan in the years immediately following Japan's defeat in World War II.
The Treaty of San Francisco (1951) Japan was able to create a 75,000 strong army called the 'self-defence force'. The US retained influence in Japan via the American-Japanese Security Treaty, which enabled the US to retain military bases in the country. The return of someone to their own country.
Japan was occupied by Allied military forces under command of U.S. General Douglas MacArthur. Japanese society was remodeled along western lines. A new constitution renounced war as a national policy and established a parliamentary system and reduced the power of the emperor (forced to announce he's not a god).
Japan and the United States were not then at war, although their conflicting interests were threatening to turn violent. The attack turned a dispute into a war; --Pearl Harbor was a crime because the Japanese struck first. Sixty years later, the administration of President George W.
Chinese suffering during the war is not in dispute. Some 14 million Chinese died and up to 100 million became refugees during the eight years of the conflict with Japan from 1937 to 1945.
The United States Army carried out 141 executions over a three-year period from 1942 to 1945 and a further six executions were conducted during the postwar period, for a known total of 147.
Japan was disarmed, its empire dissolved, its form of government changed to a democracy, and its economy and education system reorganized and rebuilt. Years of reconstruction were required to recover from thousands of air raids, including the atomic bombings of Hiroshima and Nagasaki.
The most important reform carried out by the occupation was the establishment of a new constitution. In 1945 SCAP made it clear to Japanese government leaders that revision of the Meiji constitution should receive their highest priority.
On May 3, 1947, Japan's postwar constitution goes into effect. The progressive constitution granted universal suffrage, stripped Emperor Hirohito of all but symbolic power, stipulated a bill of rights, abolished peerage, and outlawed Japan's right to make war.