Huh.

So I was wondering where the US was and dug in a little more. It looks as if the source of this picture is here. From what I can tell,

• This was the third Noble Raven this year: Noble Raven 24-3
• There were two in 2022
• The US usually participates, but were not involved in 24-3
• Submarines from various countries usually (always?) take part.
• We (the US) took part in the first one this year
• The countries involved in each exercise are often different; the only consistent participant is Japan

The last point leads me to believe that Japan is the organizer of these parties.

Also, there’s a related repeated exercise called Noble Jump, which is different branches; last year’s had Italian hand-launched drones called “Ravens,” which makes for interesting search results.