The Navy intends to award a firm fixed-price, sole source purchase order to ATAC Corporation for renewal of I-SIM Embedded Trainer maintenance and support. Only authorized ATAC distributors with an official letter of authorization will be considered, and all offerors must be registered in SAM.gov. Interested parties may submit proposals, but this notice is not a request for competitive proposals; however, all responses received by the stated cutoff will be reviewed to determine whether competitive procurement is warranted. No performance location or budget figures are provided in the notice.