Grissom holds Firecracker 5K Published June 30, 2021 By Tech. Sgt. Josh Weaver GRISSOM AIR RESERVE BASE, Ind. -- Runners at Grissom take off at the start of the Firecracker 5K held here June 30, 2021. Grissom holds monthly 5K runs to promote fitness and camaraderie. The next run is the Dog Days of Summer 5K and is scheduled for July 28.