The Department of Defense, specifically the Department of the Army, is issuing a Request for Solutions (RFS) for the Training and Readiness Accelerator (TReX II) Other Transaction Agreement (OTA) focused on the Role 4 (Definitive Care) Modeling and Simulation Tool Prototype Project. This initiative aims to foster innovative development and expedited delivery of prototypes that enhance Warfighter readiness through modeling, simulation, and training, directly supporting the Defense Health Agency's Medical Simulation and Training Program. Interested parties must be members of the TReX II consortium to respond to the solicitation, and further details can be found at https://www.trexii.org/. For inquiries, contact Jessica Wasser at jessica.l.wasser.civ@army.mil or Monica J Escalante at monica.j.escalante.civ@army.mil.