This Sources Sought Notice is being issued by the Department of Defense (DoD), Washington Headquarters Services (WHS) Acquisition Directorate (AD) on behalf of the Office of the Under Secretary of Defense (OUSD) Research and Engineering, Department of Defense Office of Strategic Capital (OSC). WHS(AD) is performing market research by issuing this Sources Sought Notice to obtain information and assist in determining the availability, interest, and capability of potential firms to provide services for OSC Environmental Due Diligence Services. This Sources Sought Notice shall not be construed as a Request for Proposal or a Request for Quote. The estimated period of performance for this requirement is for a five (5) year ordering period with a $35 Million to $75 Million price range. Please reference the Sources sought Notice (SSN) for specific details as it pertains to the requirements of this notice.