The United States first employed motorcycles in hunting down Panco Villa and his troops in the Mexican Revolution. Then in the Great War motorcycles went to Europe with the doughboys.
Here are the "War Warriors" of the American and British motorcycle corps.
The U.S. introduced the Harley-Davidson Model 17F/J in 1917. It was quick and responsive, agile and versatile, for the times. It could be outfitted with stretchers, sidecars, shields and machine guns.
Just a side note not related to motorcycles: We watched The Lost Battalion, 2001, again tonight which stars Rickie Schroeder. I highly recommend it. The costuming, reality, diversity of the ranks, and the courageous story are all riveting.