Commander: Has the authority to force his decisions on others.
Leader:
1.) Knows how to decrease entropy (chaos and disorder) and has the will to act in that direction.
2.) Works for the betterment of those that follow.
3.) A leader may or may not have followers and may or may not be wealthy.
4.) The top followers of a significant group also need to be leaders.
5.) A leader rules without the necessity of force.
The USA has many commanders, but few leaders that are followed. It is easy to be a commander.