For national security it would be the secretary of defense.
Susan Rice is the national security adviser. John Kerry is Secretary of State. Ashton Carter is Secretary of Defense. Jeh Johnson is Secretary of Home Security. Gen. Joseph Dunford is Chairman of the Joint Chiefs of Staff, Gen. James Clapper is Director of Intelligence, Tony Blinken is the Deputy National Security Advisor and Denis McDonough is the Whitehouse Chief of Staff.
The National Security Council in the United States is responsible for informing the President of the United States about breaches in the security of the country. They also advice the President about what to do in the case of this breach in security.
The National Security Act of 1947 is the law that unified the armed forces by creating the Department of Defense. The Department of Defense is a Cabinet post that assists the President of the United States in protecting the country.
The MARSOC element that trains, advises, and assists friendly host nation forces is known as the Marine Special Operations Command (MARSOC) Marine Special Operations Teams (MSOTs). These teams work closely with naval and maritime military and paramilitary forces to enhance their capabilities in maintaining internal security. By providing specialized training and support, MARSOC helps these forces improve their operational effectiveness and strengthen their ability to support their governments. Ultimately, this collaboration aims to promote stability and security within the host nation.
The House of Representatives and the Senators.
The Joint Staff operates under the exclusive authority, direction, and control of the Chairman of the Joint Chiefs of Staff (CJCS). It assists the CJCS in overseeing the planning and coordination of military operations and policy among the various branches of the armed forces. The Joint Staff ensures that military strategies and operations align with national security objectives and directives from the President and Secretary of Defense.
Cabinet Secretaries
A small group that makes up the executive office of the president these individuals and agencies directly assist the president
Line manager A manager who is authorized to direct the work of subordinates and is responsible for accomplishing the organization's tasks. Staff manager A manager who assists and advises line managers.
Veto
The Vice President is the President of the Senate, a largely ceremonial role, whose only real power lies in breaking tie votes in the Senate, the strongest recent example of which was Al Gore breaking the 50-50 tie in the Senate for the Clinton Tax Hikes of 1993.
Senator Joseph(Joe) Biden, is actually Vice President Biden, and assists the president. Joe Biden comes from the state of Delaware.