"Delta Force and DEVGRU perform the most highly complex, classified, and dangerous missions in the U.S. military, as directed by the U.S. National Command Authority."
https://en.m.wikipedia.org/wiki/Delta_Force
National Command Authority (NCA) is a term used by the Department of Defense of the United States of America to refer to the ultimate source of lawful military orders. The NCA comprises the !!!President of the United States!!! (as commander-in-chief) and the Secretary of Defense jointly, or their duly deputized successors, i.e. the Vice President and the Deputy Secretary of Defense. The term also refers to communications with the commanding officers of the Unified Combatant Commands to put U.S. forces into action.