We could not find a consolidated
definition of "contractor support services". However, this term would generally mean "Knowledge Based Services", commonly referred to as Advisory and Assistance Services (A&AS), which are associated with tasks that require the application of detailed processes or technical knowledge. Additionally, this term is also used to refer to Research and Development (R&D) Services. We believe that a good place to start your search for the information that you seek would be in the on-line DAU Service Acquisition Mall (SAM) website.
The information on "Knowledge Based Services" can be found in SAM at the following link:
The information on "Research and Development (R&D) Services" can be found in SAM at the following link: http://sam.dau.mil/Content.aspx?currentContentID=c3372ff9-cd03-437c-8a5f-dea53b69ca66
You may find additional information by searching the entire Service Acquisition Mall found at the following link: http://sam.dau.mil/default.aspx
Finally, you may find even more information by searching the entire DAU "Acquisition Center of Excellence (ACE) for Services" at: https://acc.dau.mil/ace