The 19th Sergeant Major of the Marine Corps, Sgt. Maj. Troy E. Black, poses for a photo with sergeants major attending Keystone at the National Defense University at Ft. McNair, District of Columbia, June 7, 2021. The Sergeant Major of the Marine Corps and his fellow Senior Enlisted Advisors, addressed questions posed by Keystone students. The Keystone Course will educate Command Senior Enlisted Leaders currently serving in or slated to serve in a general or flag officer level joint headquarters or Service headquarters that could be assigned as a joint task force.

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Keywords: ., 19th, advisors, black, corps, enlisted, joint, major, marine, pme, senior, sergeant, smmc, troy