Deregisters the specified AMI. After you deregister an AMI, it can't be used to launch new instances; however, it doesn't affect any instances that you've already launched from the AMI. You'll continue to incur usage costs for those instances until you terminate them.
ec2_deregister_image(ImageId, DryRun)[required] The ID of the AMI.
Checks whether you have the required permissions for the action, without
actually making the request, and provides an error response. If you have
the required permissions, the error response is DryRunOperation.
Otherwise, it is UnauthorizedOperation.
svc$deregister_image( ImageId = "string", DryRun = TRUE|FALSE )
When you deregister an Amazon EBS-backed AMI, it doesn't affect the snapshot that was created for the root volume of the instance during the AMI creation process. When you deregister an instance store-backed AMI, it doesn't affect the files that you uploaded to Amazon S3 when you created the AMI.