DOughboys
The American troups were called doughboys in World War I.
Because they're weird.
They called American troops "Gringos"
It was the American Civil War where American troops wore flat caps called kepis.
Around 16 Million US troops were deployed during World War 2.
Common nicknames were "redcoats" for British troops and "Yankees" or "colonials" for American troops.
Throughout the war the number of American Troops continued to grow in response to the position of the war. By August 1918, there were nearly 1,500,000 American troops in the European Campaign.
American soldiers were called Yanks by the Allies and Ami or Amis by the Germans
The island was called Iwo Jima on where the Americans troops raised the flag
west of france
American troops during various conflicts were often referred to as "GIs," which stands for "Government Issue." This term became particularly popular during World War II. Additionally, soldiers were sometimes called "doughboys," a nickname that originated during World War I. Support personnel, including medics and engineers, were typically referred to as "support troops" or "auxiliary personnel."
Mostly by Train and Ship. Later by truck and foot.