Unidentified rocket debris

[Pishwish]

Apologies if there is a general thread for recovered rocket debris, I couldn't find it. https://www.msn.com/en-ie/news/national/rocket-found-off-irish-coast-shrouded-in-mystery-as-virgin-orbit-rules-out-ownership/ar-AA1cG2tl

Mystery surrounds the discovery of a rocket engine by fishermen from West Cork after Virgin Orbit has confirmed it does not belong to them.

 

It is believed the rocket could belong to Aerojet Rocketdyne but the company has yet to confirm.

Now, I am no expert,  but it looks like this is a stage from a solid rocket like a Minuteman. I'm assuming the outer nozzles are missing and that this is a second or third stage (Aerojet did make 2nd stage minuteman stages apparently). Since it was hauled from the seabed and seems to have a ferrous metal casing, I can't imagine it floated for long after it hit the water. So why is it 200 km west of Ireland? Is this an ICBM stage, a suborbital or military test launch, an expended stage of an orbital rocket like Minotaur, or is it an upper stage of a failed orbital launch?

[Pishwish]

Ah, I see where they get Aerojet Rockedyne from. A photo of the rocket casing in this https://www.echolive.ie/corknews/arid-41161402.html version of the story shows that
 MFG: Aerojet Rocketdyne
 MFG: CAGE Code 62006
is written on the side.

[deltaV]

Ah, I see where they get Aerojet Rockedyne from. A photo of the rocket casing in this https://www.echolive.ie/corknews/arid-41161402.html version of the story shows that
 MFG: Aerojet Rocketdyne
 MFG: CAGE Code 62006
is written on the side.

Aerojet Rocketdyne is very old but they only got that name in 2013 when
Aerojet bought Rocketdyne. So the rocket must be newer than 2013.

[Galactic Penguin SST]

Someone has identified it as the booster stage for the SM-2/3/6 missiles:

https://twitter.com/John_A_Ridge/status/1670226080395829249

[Pishwish]

That seems to be it thanks, even has the square bit in the centre.