These workers install, fix and maintain elevators, escalators, moving walkways, chairlifts and other lifts. 

To become an elevator technician, you’ll need a high school diploma, and to complete an apprenticeship program sponsored by a union, industry association or individual contractor. Most states require a technician to be licensed and finish additional on-the-job training. 

Median annual salary: $102,420

These workers control boilers, turbines, generators and other systems in a plant that generates and distributes electric power. 

Power plant operators typically only need a high school diploma, though the role also requires extensive on-the-job training. You’ll also need a license from the Nuclear Regulatory Commission.

Median annual salary: $100,890

Air traffic controllers direct aircraft in the ground and air, controlling all ground traffic on runways and taxiways and giving landing and takeoff instructions to pilots. 

To become an air traffic controller, you’ll need at least an associate’s degree from the Air Traffic Collegiate Training Initiative program and to complete training at the Federal Aviation Administration (FAA) academy, as well as other on-the-job training. 

Median annual salary: $137,380

Nuclear technicians work alongside physicists, engineers and other scientists in nuclear energy production, operating and maintaining nuclear testing equipment. Testing air, water and soil samples for radioactive contamination can be another aspect of the job.

To become a nuclear technician, you’ll need an associate’s degree in nuclear science or nuclear-related technology. Extensive on-the-job training is also required.

Median annual salary: $101,740

First-line supervisors of police and detectives oversee members of a police force, managing schedules, training staff and coordinating investigations. Supervisors often act as liaisons between officers and higher-ranking officials, maintaining order and communication.

To become a supervisor, you’ll need at least a high school diploma and previous experience in the field, like working as a police officer or detective. Some employers might require an associate’s or bachelor’s degree in criminal justice. 

Median annual salary: $101,750