Airman Calvin Kirby, 362nd C-130 crew chief apprentice course student, removes a C-130 Hercules' tire at Sheppard Air Force Base, Texas, Nov. 29, 2018. The C-130's tires weigh almost 500 pounds and are made to withstand emergency landings, enemy fire and other stressful situations these planes and their crews will have to fly through. C-130 crew chiefs, like Kirby, will change these tires on different occasions from natural wear and tear to changing all the tires during high-profile missions to reduce any possibilities of problems occurring during that mission. (U.S. Air Force photo by Airman 1st Class Pedro Tenorio)