Derby students visit 931st Published Feb. 9, 2010 MCCONNELL AIR FORCE BASE, Kan. -- Airmen of the 931st Air Refueling Group welcomed members of the Derby Middle School Gifted Class to McConnell Air Force Base, Kan., on Feb. 5. The students toured areas of the 931st that related to their career interests. The 931st is an Air Force Reserve unit at McConnell. (Courtesy photo)