Colonel Robert Bowersox, 79th Medical Wing Commander and Chief Master Sgt. Michelle Thorsteinson-Richards, 79th Medical Wing Command Chief congratulate the 779th Medical Group Master Sgt. Selectees at a party on Joint Base Andrews, Md. 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)