Why SP use "Mk" for first stages?

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Just spoke to a SP old-timer. “Mark” was selected by Bonin from the old dive helmets.

Now, time to start worrying about real important things like the RWC on Sat.
 
Just spoke to a SP old-timer. “Mark” was selected by Bonin from the old dive helmets.

Now, time to start worrying about real important things like the RWC on Sat.
Because Calypso and Conshelf were already taken?
 
https://www.shearwater.com/products/teric/

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