senderName_abbreviation<senderName> gives an abbreviation (…) with no jurisdiction beside it — no state or place name — so it doesn't tell the public who is speaking.
<senderName> is where a message says who is speaking. An abbreviation there is fine beside the jurisdiction it belongs to ("Lauderdale EMA", "NV OEM", "Spokane Valley PD"), but on its own ("OCV", "KYEOC") or beside only generic words ("Console 3 - MJOC", "VDEM - Operations") it leaves a recipient no way to tell which agency sent the alert. A jurisdiction is a state code or a place name.