I appreciate the help but that is not a solution to this query. That does not necessarily identify all records from Table A that may not be in Table B or Table C.
What I have come up w/ however that does appear to work is the following:
FROM A JOIN B ON A.UUID = B.UUID
JOIN C ON B.ProcedureUUID= C.ProcedureUUID
WHERE SW_Name like 'SoftwareX') AS DRV1
RIGHT OUTER JOIN A on DRV1.Name = A.Name