This is an unrestricted, full and open, Request for Proposal for the establishment of a Multiple Award Task Order Contract (MATOC).The ordering period will consist of a 24-month base period and three 12-month option periods, for a total potential ordering period of 60 months, if all options are exercised. The overall objective of this procurement is to augment ERDCs ship simulation capabilities by acquiring specialized, independent maritime simulation and engineering support services to deliver technically rigorous, time-sensitive simulation solutions to USACE navigation challenges. The Contractor shall independently execute designated simulation tasks, conduct technical analyses, and deliver finalized engineering reports as specified in individual Task Orders, leveraging external maritime expertise to support the USACE navigation mission. Navigation study services not directly connected with project maintenance and operations are considered commercial activities and not inherently governmental. (33 U.S.C. 2321(b)).