The Mission Statement of NAMI Johnston County, NC, Inc. As an affiliate of the National Alliance on Mental Illness (NAMI), NAMI Johnston County, NC, Inc operates under the spirit of the by-laws of NAMI and NAMI North Carolina. The mission of NAMI Johnston County, NC, Inc is to provide support, education, advocacy, as well as public awareness in Johnston County, North Carolina so that all affected by mental illness can build better lives.