AWS_DEFAULT_REGION should be used over EC2_REGION
AWS_DEFAULT_REGION is the standard environment variable name for the region. See: https://docs.aws.amazon.com/cli/latest/userguide/cli-configure-envvars.html
UNCLASSIFIED - NO CUI
AWS_DEFAULT_REGION is the standard environment variable name for the region. See: https://docs.aws.amazon.com/cli/latest/userguide/cli-configure-envvars.html
UNCLASSIFIED - NO CUI