What type of letter must be sent to claimants when evidence is insufficient for special issue claims?

A development letter is essential in the context of claims, especially when evidence is insufficient for special issue claims. This type of letter is used by the Veterans Affairs (VA) to solicit additional information or evidence from the claimant, explaining what specific information is needed to support their claim adequately.

When a claim is submitted, there are instances where the provided evidence does not meet the requirements necessary for the VA to make a decision. The development letter serves to clarify these deficiencies and prompts the claimant to gather and submit the required documentation, which could include medical records, service records, or further statements regarding their claim.

The development letter is crucial as it establishes a clear line of communication between the VA and the claimant, ensuring that the claims process continues and that the claimant has the chance to strengthen their case. This not only benefits the claimant by providing an opportunity to address gaps in their evidence but also supports the VA's efforts to fully assess and adjudicate claims accurately.