If you do not wish to use a service account permanently, you can delete it.
Procedure
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From the navigation menu, go to IAM > Users.
The Users page appears.
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On the Service Accounts tab, click the service account that you want to delete.
The service account details page appears.
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Click Actions, and then select Delete.
The Delete Service Account confirmation dialog box appears.
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In the field box, type DELETE.
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Click Delete.