A professional who guards industrial or commercial property against fire, theft, vandalism, and illegal entry, performing any combination of following duties. Respnsibilities include:

• Patrols, periodically, buildings and grounds of industrial plant or commercial establishment, docks, logging camp area, or work site.
• Examines doors, windows, and gates to determine that they are secure.
• Warns violators of rule infractions, such as loitering, smoking, or carrying forbidden articles, and apprehends or expels miscreants.
• Inspects equipment and machinery to ascertain if tampering has occurred.
• Watches for and reports irregularities, such as fire hazards, leaking water pipes, and security doors left unlocked.
• Observes departing personnel to guard against theft of company property.
• Sounds alarm or calls police or fire department by telephone in case of fire or presence of unauthorized persons.
• Permits authorized persons to enter property.
• May register at watch stations to record time of inspection trips.
• May record data, such as property damage, unusual occurrences, and malfunctioning of machinery or equipment, for use of supervisory staff.
• May perform janitorial duties and set thermostatic controls to maintain specified temperature in buildings or cold storage rooms.
• May tend furnace or boiler.
• May be deputized to arrest trespassers.
• May regulate vehicle and pedestrian traffic at plant entrance to maintain orderly flow.
• May patrol site with guard dog on leash.
• May watch for fires and be designated Fire Patroller.
• May be designated according to shift worked as Day Guard; area guarded as Dock Guard; Warehouse Guard; or property guarded as Powder Guard.
• May be designated according to establishment guarded as Grounds Guard, Arboretum; Guard, Museum (museums); Watchguard, Racetrack; or duty station as Coin-Vault Guard.
• May be designated Guard, Convoy when accompanying or leading truck convoy carrying valuable shipments.
• May be designated. Respnsibilities include:
• Armed Guard; Camp Guard; Deck Guard; Night Guard; Park Guard.