Letters of Support are a third party validation of your product/project. It is one of the most important parts of your SBIR process.
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Under any proposal preparation on TurboSBIR, you can find a "Letters of Support" tab where you can request any number of letters.

Clicking request brings you to templates where you can draft and edit the letter to your liking.

Once completed, you can send your letter either through a public link or email (which includes the public link).

The public link allows the recipient to download the form, review, edit, and sign the draft sent to them. Once the recipient re-uploads the completed letter, you can download it from the Letters of Support tab under each unique send using ⋮

You can keep track of all unique instances of letter requests using the Letters of Support tab.