Question

What was the goal for The Corps Of Discovery?

Answer 1

1. Explore the Missouri River to its source, cross the Rocky Mountains, and seek a westward-flowing river to the Pacific Ocean—the fabled Northwest Passage.
2. Report on new animals, plants, minerals, etc. in the newly-acquired regions.
3. Establish trade with the Native American tribes they encountered.
4. Assure the Native Americans of the peaceful intentions of the United States government. 

Answer 2

The members of the Corps of Discovery were soldiers, but their purpose was peaceful -- exploration, diplomacy, and science. Lewis was commissioned as a Captain of the Army of the United States, Clark as a Lieutenant (although this inferior rank was kept secret from the men, and Clark was always called "Captain").