Why do you think it is important that the President select the executive department heads (the Cabinet)?

to help him run the presidential office

roosevelt believed that in light of the country's recent military successes, it was unnecessary to use force to achieve foreign policy goals, so long as the military could threaten force. this belief, and his strategy of “speaking softly and carrying a big stick,” shaped much of roosevelt's foreign policy.

to force terrorists groups to stop attacking western targets using massive military force.