Here are the latest changes. Instead of using them local, I went to the remote for both js files
<script language="javascript" src="http://code.jquery.com/jquery-1.8.3.min.js" type="text/javascript"></script>
<script language="javascript" src="http://cdnjs.cloudflare.com/ajax/libs/jquery.SPServices/2013.01/jquery.SPServices-2013.01.min.js" type="text/javascript"></script>
<script language="javascript" type="text/javascript">
// ExecuteOrDelayUntilScriptLoaded(loadCascadingDDL, "sp.js");
$(document).ready(function() {
alert(SPGetCurrentUser());
$().SPServices.SPCascadeDropdowns({
relationshipList: "Systems",
relationshipListParentColumn: "RegionFullName",
relationshipListChildColumn: "SiteFullName",
parentColumn: "Region",
childColumn: "System"
}
</script>