Why scripted language, for the least scriptable moment
The objection to scripts is that a notification is not a performance, and that is right. The reason to carry them anyway is that the chaplain is also a person absorbing the same event, and the sentence that has to be said first is the one most likely to come out softened. Softened language is not kindness. A brain in shock cannot decode a euphemism, and every minute a family spends misunderstanding is a minute stolen from them.
These are anchors for the opening, not a text to recite. Everything after the first sentence belongs to the family.
What this does not cover
The scripts address the notification itself. They do not cover the hours that follow, the agency-side coordination, the line-of-duty sequence, or the care the chaplain will need afterwards. That fuller treatment is in Chaplain with a Badge; the framework around it is in the guide on critical incident response.