In the Infopedia episode guide for episode #78 Ghost Town it says:
A message comes across the screen: “This is Expeditionary Force calling Earth. If anyone is reading this message, here are your orders. All Invid military outposts must be destroyed. Admiral Hunter is planning a major offensive, and calls upon all surviving forces to help destroy any military objectives.”
I’ve listened to that many times and I can clearly hear Gabby’s son say “SDF-4” and not “Expeditionary Force” when he says that. I think someone might have said Expeditionary Force somewhere else in this episode but that wasn’t it. It looks like a lot of these synopses came out of Robotech Art 1.