19. James Mattis
Nicknamed “Mad Dog,” General James Mattis served as Secretary of Defense under President Trump, bringing a reputation for uncompromising military expertise and principled leadership. Mattis was widely respected by service members and allies, but his frequent policy disagreements with the administration—particularly on alliances and troop withdrawals—eventually led to his resignation. His tenure sharply polarized opinions, as some praised his commitment to tradition and order while others viewed his departure as evidence of deep rifts in defense policymaking (via Reuters).
