To support my point I refer you to the US Dept of Labor - Bureau of Labor Statistics - Standard Occupational Classifications.
"The SOC system is used by Federal statistical agencies to classify workers into occupational categories for the purpose of collecting, calculating, or disseminating data. All workers are classified into one of 840 detailed occupations according to their occupational definition. To facilitate classification, detailed occupations are combined to form 461 broad occupations, 97 minor groups, and 23 major groups. Detailed occupations in the SOC with similar job duties, and in some cases skills, education, and/or training, are grouped together."
I challenge you to find "Contract Manager" among the many hundreds of occupational classifications:
http://www.bls.gov/soc/major_groups.htm