This is a modification to the synopsis entitled Space Launch System (SLS) Advanced Booster Engineering Demonstration and/or Risk Reduction which was posted on January 19, 2012. This modification is notify industry that the NRA proposal validity date for further selection of non-selected engineering demonstration and/or risk reduction (EDRR) effort is hereby amended to August 31, 2012. No additional selections for negotiation and potential award will be made against NRA NNM12ZPS001N. For EDRR effort initially selected for negotiation and potential award, proposal validity will continue through negotiation and award of any subsequent contract. Documents related to this procurement will be available over the Internet. These documents will reside on a World Wide Web (WWW) server, which may be accessed using a WWW browser application. The Internet site, or URL, for the NASA/MSFC Business Opportunities home page is http://prod.nais.nasa.gov/cgi-bin/eps/bizops.cgi?gr=D&pin=62 Offerors are responsible for monitoring this site for the release of the solicitation and any amendments. Potential offerors are responsible for downloading their own copy of the solicitation and amendments (if any).

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