Maintainers take over when operations cease Tech. Sgt. Robert Burton, a C-130 Hercules aircraft maintainer, performs a filter replacement on an engine June 25 at Chino Municipal Airport, Chino, Calif. Sergeant Burton is joined by members of his North Carolina-based Air National Guard unit, the 145th Airlift Wing in support of firefighting missions throughout California. The 145th AW and its Airmen are assigned to the 302nd Air Expeditionary Group at the Chico airport. (U.S. Air Force photo/Senior Airman Stephen Collier)