If you wanted to look at a macro solution, the code that would remove your existing xml and introduce a new named xml file might look like the following. You could add to the sFields line to include more element names. Note that you will need to relink your existing CCs any time you change the namespace (the sNS value in this code).
Code:
Sub AddCustomPart()
MsgBox fnCustomPart.XML, vbOKOnly, "Custom XML added"
End Sub
Function fnCustomPart() As Office.CustomXMLPart
'Creates/Recreates the standard CustomXmlPart (and removes xml with blank namespaces)
Dim arrElements() As String, iElement As Integer, sFields As String, sXML As String, sNS As String
Dim oXMLPart As Office.CustomXMLPart
sNS = "http://schema.usaf.gov/commandchange"
For Each oXMLPart In ActiveDocument.CustomXMLParts
If oXMLPart.NamespaceURI = sNS Or oXMLPart.NamespaceURI = "" Then
Debug.Print oXMLPart.XML
oXMLPart.Delete
End If
Next
sFields = "chaplin|cot|cotr|guideon|icc|iccfn|iccr|narr|narrr|narrfn|occ|occfn|occr|po|pofn|poduty|por|sq_grp|vol|volr|formation"
arrElements = Split(sFields, "|")
For iElement = LBound(arrElements) To UBound(arrElements)
sXML = sXML & " <" & arrElements(iElement) & " />" & vbCr
Next iElement
sXML = "<?xml version='1.0' encoding='utf-8'?>" & vbCr & "<Root xmlns='" & sNS & "'>" & vbCr & sXML & "</Root>"
Set fnCustomPart = ActiveDocument.CustomXMLParts.Add(sXML)
'Debug.Print AddCustomPart.XML
End Function