The NCA was first alluded to in a 1960 Department of Defense document. It included at least the president of the United States as commander-in-chief and sometimes the vice president, secretary of defense, or the Joint Chiefs of Staff, and/or their alternates and successors. The term has no statutory or constitutional basis and was replaced in 2002 in favor of explicitly referring to the president and/or the secretary of defense.
Authorization of a nuclear or strategic attackEdit
Only the president can direct the use of nuclear weapons by U.S. Armed Forces, through plans like OPLAN 8010-12. The president has unilateral authority as commander-in-chief to order that nuclear weapons be used for any reason at any time. 
Notes and referencesEdit
- Abrams, Herbert L. (1994). The President Has Been Shot: Confusion, Disability, & the 25th Amendment. Stanford, California: Stanford University Press. p. 323. ISBN 0-8047-2325-7. Retrieved November 9, 2020.
- Croddy, Eric A.; Wirtz, James J.; Larsen, Jeffrey A. (2005). Weapons of Mass Destruction: An Encyclopedia of Worldwide Policy, Technology, and History. Santa Barbara, California: ABC-CLIO. p. 66. ISBN 1-85109-490-3. Retrieved November 9, 2020.
- Blair, Bruce (June 11, 2016). "What Exactly Would It Mean to Have Trump's Finger on the Nuclear Button?". Politico Magazine. Retrieved 2019-06-30.
- Broad, William J.; Sanger, David E. (August 4, 2016). "Debate Over Trump's Fitness Raises Issue of Checks on Nuclear Power". The New York Times. p. A1. Retrieved October 2, 2016.
- Burns, Robert (2017-11-13). "Could anyone stop Trump from launching nukes? The answer: No". Associated Press. Retrieved 2019-06-30.
- Stanton, Zack (2017-11-14). "Don't Count on the Cabinet to Stop a Trump-Ordered Nuclear Strike". Politico Magazine. Retrieved 2019-06-30.