Any NavyAnons that can comment on a sailor’s duty station while their vessel is in dry-dock?

Trying to figure why the Pearl Harbor shooter would come into conlflict with civilian dry-dock personnel.

Can only speculate that he had no authority to be there, wanted to access the ship (to get something? contraband?) they told him to fuck off and clear the area, he came armed, or came back armed a the shit hit the fan?