Kennedy's program called flexible response focused on building up what sort of military forces in America?

Kennedy's flexible response program emphasized the development of a range of military capabilities, particularly conventional forces and specialized units, to address various levels of conflict. This strategy aimed to provide the U.S. with the ability to respond to aggression with appropriate force, whether it was conventional warfare, guerrilla tactics, or nuclear threats. The focus was on building up the Army, Navy, Air Force, and Marine Corps to ensure a versatile and adaptable military response.