Airmen play wallyball inside the Bellamy Fitness Center during Wingman Day at Ellsworth Air Force Base, S.D., April 20, 2018. Wingman Day is a semiannual event that focuses on developing the four pillars of Comprehensive Airmen Fitness, and recently focused on strengthening the physical and social pillars through physical and team-building activities. (U.S. Air Force photo by Senior Airman James Miller)