In the 1850s, the U.S. Secretary of War Jefferson Davis established a short-lived 'Corps' using what animal to transport supplies across the American Southwest?

Camels

After years of advocacy by Jefferson Davis, Congress appropriated $30,000 in 1855 to acquire and test camels for Army transportation. The animals proved effective at carrying heavy loads in the Southwest, but the Civil War interrupted the experiment and the surviving camels were later sold.