In 1856, the US Army experimented with using these as transport animals.
Elephants
Camels
Yaks
St. Bernard dogs
Camels. Congress appropriated $30,000 for the experiment and 30-some of the humpbacks arrived at Indianola, Texas in April 1856. The Camel Corps was largely successful but the Civil War brought an end to it – though at least one camel saw service with the Confederates in Mississippi.