Yes, to receive federal funding you will need to obtain registration with SAM. It is not really a number as much as a registration with them. Per section 5.5. of the RFP (see the RFP for the actual links): Applicants must register to do business with the U.S. Federal Government by completing a registration process in the Federal System for Award Management, SAM.gov. As a part of that SAM.gov registration process, applicants will obtain a Unique Entity ID (formerly a Data Universal Numbering System (DUNS) number). If you are already registered in SAM.gov, then you have already been assigned a Unique Entity ID and it is viewable in your SAM.gov entity registration record. Proof of registration, including your entity’s Unique Entity ID, must be supplied to the Administrators before funds are disbursed. Since registration may take up to one month, it is recommended to begin that process now. If you have not already registered in SAM.gov, please click on this link, SAM.gov, to complete your registration.