@java.lang.Override
  public com.google.cloud.tpu.v2.ServiceAccountOrBuilder getServiceAccountOrBuilder() {
    return serviceAccount_ == null
        ? com.google.cloud.tpu.v2.ServiceAccount.getDefaultInstance()
        : serviceAccount_;
  }
<pre>
The Google Cloud Platform Service Account to be used by the TPU node VMs.
If None is specified, the default compute service account will be used.
</pre>

<code>.google.cloud.tpu.v2.ServiceAccount service_account = 37;</code>
java-tpu/proto-google-cloud-tpu-v2/src/main/java/com/google/cloud/tpu/v2/Node.java