| Item | Obligations |
|---|---|
| Engineering Services | $274M |
| Computer Systems Design Services | $196M |
| Security Systems Services (except Locksmiths) | $90M |
| Administrative Management and General Management Consulting Services | $69.7M |
| Other Communications Equipment Manufacturing | $38.1M |
| Air Traffic Control | $26.6M |
| All Other Professional, Scientific, and Technical Services | $19.1M |
| Other Computer Related Services | $19M |
| Research and Development in the Physical, Engineering, and Life Sciences (except Biotechnology) | $14.5M |
| Human Resources Consulting Services | $14.2M |
Engineering Services is Serco's largest federal market, with $274M in obligations.