YOUNGSTOWN AIR RESERVE STATION, Ohio -- Air Force Reserve Staff Sgt. Evan Hart, a assistant crew chief with the 910th Aircraft Maintenance Squadron, puts the finishing touches on replacing a nose landing gear tire on his assigned C-130H Hercules cargo transport aircraft as the aircraft's primary crew chief, Master Sgt. Ernie Johnson, also with the 910th AMXS, checks his work on the flightline here, August 2, 2011. Sergeants Hart and Johnson are performing the work as part of the continuously scheduled maintenance that keeps the 12 C-130s assigned to the 910th Airlift Wing in good flying order and ready to complete the wing's airlift, airdrop and aerial spray missions anytime, anywhere around the globe at a moment's notice. U.S. Air Force photo by Master Sgt. Bob Barko Jr.