| Item | Obligations |
|---|---|
| Engineering Services | $376M |
| Computer Systems Design Services | $197M |
| Security Systems Services (except Locksmiths) | $101M |
| Administrative Management and General Management Consulting Services | $79.3M |
| Other Communications Equipment Manufacturing | $38.1M |
| Custom Computer Programming Services | $36.7M |
| Air Traffic Control | $33.7M |
| All Other Professional, Scientific, and Technical Services | $25.9M |
| Human Resources Consulting Services | $25.8M |
| Research and Development in the Physical, Engineering, and Life Sciences (except Biotechnology) | $23.7M |
Engineering Services is Serco's largest federal market, with $376M in obligations.