ELLSWORTH AIR FORCE BASE, S.D. -- Airman 1st Class Matthew Mcfarlan, 28th Aircraft Maintenance Squadron crewchief, talks with a maintainer inside a B-1B Lancer during a pre-flight inspection, Feb. 26. Inspections are performed to ensure aircraft systems are working properly and ready for flight. (Air Force photo/Airman 1st Class Joshua J. Seybert)