This is a five-year, firm-fixed-price contract for the overhaul of specific power turbine modules, with an estimated quantity range of 25 to 390 units. The work can only be performed by a source approved by the System Readiness Directorate (SRD), and four pre-approved large businesses are identified. Companies not currently approved must submit a Source Approval Request (SAR) to SRD to be considered. The requirement is currently unfunded, and any award will be withheld until sufficient funds are received. Performance is designated as FOB Origin.