Yes, the order said they would augment the AD in support of the operation. That is pretty broad, I believe purposefully. It also means they can take over AD ops freeing them for other missions.
Just one more piece to go.
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??Just one more piece to go??
POTUS retweeted this. We're getting closer! https://t.co/DxhaGsVFk3 pic.twitter.com/bKf7e2DxMf— Lisa Mei Crowley 🐸 (@LisaMei62) May 1, 2020
https://twitter.com/LisaMei62/status/1256025673883357186?s=20
Currently Title 10 Armed Forces are prohibited from engaging in civilian law enforcement. While the Navy/Marine Corps aren't mentioned in Posse Comitatus, they are statutorily prohibited to the same extent.
So the 'piece to go' is making that possible. Or allowing an expansion that allows them to assist the Marshals/Secret Service or some untitled law enforcement entity to a greater extent than is now possible under the law.