Model 351.

This is coolbert:

See from the Internet web site "The Aviationist" some video the Roc aircraft practicing for the flight and test drop of an American hypersonic missile. 

"‘This is the Real Darkstar’: We Talked With Stratolaunch Ahead of Talon-A Test"

From theaviationist.com the article by TOM DEMERLY October 21, 2022.

"Mojave Spotters Get Thrilling View of Stratolaunch Preparing for New Flights."

"The only thing faster than a Thunderbird sneak pass at a big airshow is a rumor about what 'might' be on the flying schedule. And rumors at the recent Aerospace Valley Air Show at Edwards AFB in California proved to be hypersonic when a few lucky photographers at the nearby Mojave Air and Space Port got to see actual taxi testing of the world’s largest flying aircraft, the Scaled Composites Model 351 Stratolaunch or “Roc” and its hypersonic passenger, the Talon-A. We’ve got video…"

Merely taxi on the tarmac type testing at this point. All must be made readiness and flawless before the actual test. Prudence a virtue. Go watch the various video!

Artists conception of the Stratolauncher in action: "Stratolaunch was funded by Microsoft Billionaire Paul Allen to perform aerial launches of orbital rockets." Up to three such missiles and orbital rockets can be carried at a single time.

coolbert.