His extended trips and inspection tours were to the United Kingdom in April 1941 and again in May 1942; the South Pacific in September 1942, North Africa and China in January–February 1943; the Middle East and Italy (where his party came under artillery fire) in November–December 1943; London and Normandy accompanying Marshall in June 1944; Germany and Italy in April–May 1945; the Western Pacific in June 1945; and Potsdam in July 1945.
Po dveh mesecih slabih rezultatov in ker je nasprotoval kampanji požarnega bombardiranja japonskih civilnih naselij, katero pa sta zagovarjala Arnold in njegov načelnik štaba Lauris Norstad, pa se je Arnold odločil tudi za njegovo zamenjavo.