Where were us troops first used in World War 2?

The island of Guadalcanal. The U.S. 1st Marine Division landed on August 7, 1942 and secured Guadalcanal's airfield, Tulagi's harbour, and neighbouring islands by dusk on August 8 � the Pacific war's first major Allied offensive. America's first troops arrived in the United Kingdom, prior to American involvement in the war, they provided advice and training support to the British. The first American invasion of Europe during WW2 was Operation Overlord, invasion of Normandy Beach, in 1944. Ooops ! What about Sicily ? That was the first US invasion in Europe in 1943. (Along with British & Commonwealth forces, as was Overlord)