Conduct field studies to determine traffic volume, speed, effectiveness of signals, adequacy of lighting, and other factors influencing traffic conditions, under direction of traffic engineer.

Control air traffic on and within vicinity of airport and movement of air traffic between altitude sectors and control centers according to established procedures and policies. They authorize, regulate, and control commercial airline flights according to government or company regulations to expedite and ensure flight safety.

Perform a variety of duties such as mixing materials, assembling mold parts, filling molds, and stacking molds to mold and cast a wide range of products.

Cast, anneal, solder, hammer, or shape gold, silver, pewter or other metals to form jewelry or other metal items such as goblets or candlesticks.

Lay out reference points and dimensions on metal or plastic stock or workpieces, such as sheets, plates, tubes, structural shapes, castings, or machine parts, for further processing.

Install and repair telecommunications cable, including fiber optics.

Hunt and trap wild animals for human consumption, fur, feed, bait, or other purposes.

Perform surgery and related procedures on the hard and soft tissues of the oral and maxillofacial regions to treat diseases, injuries, or defects. They diagnose problems of the oral and maxillofacial regions. They perform surgery to improve function or appearance.

Research and study the structures and chemical properties of various natural and synthetic or composite materials, including metals, alloys, rubber, ceramics, semiconductors, polymers, and glass. They determine ways to strengthen or combine materials or develop new materials with new or specific properties for use in a variety of products and applications.

Assist electrical engineers in such activities as process control, electrical power distribution, or instrumentation design. They prepare layouts of electrical transmission or distribution systems, supervise the flow of work, estimate project costs, or participate in research studies.