Military:job in recent demand
Employment of police and detectives is projected to grow 5 percent from 2012 to 2022, slower than the average for all occupations.
Police officers usually become eligible for promotion after a probationary period. Promotions to corporal, sergeant, lieutenant, and captain usually are made according to a candidate's position on a promotion list, as determined by scores on a written examination and on-the-job performance. In large departments, promotion may enable an officer to become a detective or to specialize in one type of police work, such as working with juveniles.