This shooting was 2 days before the Pensacola naval base shooting.
I missed it on the news cycle and just heard about it today when I called my DIL who’s a navy officer stationed at the same shipyard.
Evidently the shooter (who suicided after the shooting) was a crew member of a nuke sub that was in drydock. The DIL says it’s per regulation for all nuke subs to have 2 armed deck guards 24/7 when in port. She’s kinda freaked because evidently she knew and worked with a couple of the civilians who were shot.