What's the hardest obstacle in the Army?

It's the weaver and it's not even an argument. Feel free to discuss in the comments, though.

About the U.S. Army:
The Army Mission – our purpose – remains constant: To deploy, fight and win our nation’s wars by providing ready, prompt & sustained land dominance by Army forces across the full spectrum of conflict as part of the joint force.

Interested in joining the U.S. Army?
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