Mixed-education occupations with the most job openings, in thousands, projected 2006-16 Occupation Job openings (thousands) Security guards 386 First-line supervisors/managers of retail sales workers 423 General and operations managers 441 Receptionists and information clerks 489 Executive secretaries and administrative assistants 497 Bookkeeping, accounting, and auditing clerks 595 Child care workers 647 Office clerks, general 991 Customer service representatives 1,158 Retail salespersons 1,935