This is a sole source solicitation for on-site preventive maintenance and calibration services for eight Thermotron environmental chambers at the Naval Station Newport in Newport, RI. The requirement includes a one-year base period of performance from May 15, 2021, to May 14, 2022, with four one-year renewal options extending through May 14, 2026. The government intends to award this contract exclusively to VentureDyne LTD (dba Thermotron Industries) because the required proprietary services and parts can only be provided by the manufacturer's field service engineers. No budget information is specified in the description.