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The correct form used to file a service connection increase for the right knee is the 21-526EZ. This form is specifically designed for veterans to apply for disability compensation and other benefits, including requests for increases in disability ratings. When veterans believe that their service-connected condition has worsened, they can complete this form to initiate the process for an increase. The 21-526EZ facilitates the submission of relevant information and medical evidence to support the claim, streamlining the evaluation process for the Department of Veterans Affairs.

Other forms listed have different purposes; for instance, the 21-535EZ is typically used for Dependency and Indemnity Compensation (DIC), the 21-550EZ is for claims related to death benefits, and the 21-580EZ is associated with a request for apportionment of benefits. Each of these forms serves a distinct purpose, making the 21-526EZ the appropriate choice for a service connection increase for the right knee.