Who are the key advisors to the president on issues of defense?

The key advisors to the president on defense issues typically include the Secretary of Defense, who oversees the Department of Defense; the National Security Advisor, who coordinates national security policy; and the Chairman of the Joint Chiefs of Staff, who provides military advice. Additionally, the Director of National Intelligence may contribute insights on intelligence matters relevant to defense. These advisors work collaboratively to inform the president's decisions regarding military strategy and national security.