Diesel technicians inspect, maintain, repair and care for diesel engines. Some diesel technicians specialize in a specific type of vehicle. When commercial transportation has malfunctions, they diagnose the problems and find solutions.

Heavy equipment operators utilize heavy machinery often used in construction. They also clean, control, maintain, inspect and repair the machines.

Welders fuse and cut metal materials. They can work in several different industries, so welders might build structures or repair existing infrastructure.