Adding Issue Security field value to email templates

I am trying to amend the batch email templates, so that the value of the Issue Security field (plus some boiler plate text) is shown on notifications.

So far I have achieved this:

But I can’t figure out the call for the variable value.

To get the boiler plate to appear at the top of the email content section, modify IssueUpdateBatcher-content.vm

<table class="structure" width="100%" style="max-width: 960px">
      <td align="center">
         <p><h3>This email may contain proprietary information of XXX and/or third parties.</h2></p>

Can anyone advise what I need to put in the code to get the issue security level value to appear in the emails?