Colonel Robert Bowersox, 79th Medical Wing Commander, Chief Master Sgt. Michelle Thorsteinson-Richards, 79th Medical Wing Command Chief, and Chief Master Sergeant Farrell D. Thomas, Command Chief Master Sergeant for the Air Force District of Washington congratulate the 579th Medical Group Master Sgt. Selectees at a party on Joint Base Anacostia-Bolling. Advancement to master sergeant is one of the most significant promotions within the enlisted Air Force. At the rank of master sergeant, the airman enters the senior non-commissioned tier and his or her duties begin to focus on leadership and management rather than technical performance. (AF Photo by Staff Sgt. Jillian Kozub)