This is for a single-award IDIQ contract to provide global sustainment support for automated tank gauging and overfill protection systems. The contract has a five-year period of performance and requires the contractor to deliver supplies and services at various locations worldwide, including both CONUS and OCONUS. The work includes preventive and corrective maintenance, site support, documentation, and equipment support across the full lifecycle of the systems. The government anticipates a Firm-Fixed Price contract structure with a Time and Materials CLIN. The contractor must be capable of responding to multiple simultaneous requests and working at multiple global locations.