The OT for Prototype legislation has no Technology Readiness Level /Manufacturing Readiness Level restrictions. OTs must be for “prototype projects” that are directly relevant to weapons or weapon systems proposed to be acquired or developed by the DoD. In accordance with the OSD OT Guide for Prototype Projects, a prototype can generally be described as a physical or virtual model used to evaluate the technical or manufacturing feasibility or military utility of a particular technology or process, concept, end item, or system. The quantity developed should be limited to that needed to prove technical or manufacturing feasibility or evaluate military utility. In general, Research, Development, Test & Evaluation (RDT&E) appropriations will be appropriate for OT prototype projects.