Industries & Professions /
Security and Investigation
The investigation, guard, and armored car services industry employs more than 700,000 workers, of which 624,280 (87 percent) are security guards. Another 10,770 (1.5 percent) are private detectives and investigators, and 23,730 (3.3 percent) are in supervisory positions. A few thousand workers are employed as secretaries and clerks.