Promoted to
captain on 13 June 1939, Thompson commanded the United States Army Assault Training Centre at
Woolacombe in the UK from April 1943 to March 1944, with the rank of
colonel from 4 July 1943.. In this role he trained troops and developed tactics for the
amphibious assault on Normandy. In April 1945, he became the Information and Education officer of the
Communications Zone, the logistics arm of the U.S. Army in the
European Theater of Operations. As such, he was the officer responsible for the
American Forces Network in Europe, the publication of
Stars and Stripes and other G.I. periodicals, the many unit histories published for the men and women who served in them, and the re-education of large numbers of soldiers either headed home, or seeking reassignment in the
Asiatic-Pacific theater prior to the capitulation of Japan. He was promoted to
brigadier general on 6 July 1945, and was awarded an
oak leaf cluster to his Legion of Merit. Thompson was retired at his own request on 31 June 1946 with his substantive rank of major, but was promoted in retirement to his wartime rank of brigadier general on 29 June 1948. In addition to his distinguished American decorations, he had also been awarded the French
Commander of the Legion of Honour and
Croix de Guerre (1939–1945) with palm, and made Commander of the Belgian
Order of Leopold II and an honorary
Officer of the Order of the British Empire. ==Later life==