It seems so odd that anyone wielding a space cannon would call themselves a "Weapons Specialist". Isn't that so clunky and sterile?
By this same logic, we should call the Scientist the "Information Specialist", the Engineer the "Power Specialist", and the Captain the "Herding-Cats Specialist".
I propose that the Weapons Specialist be renamed the "Gunner". Important to note: this does not connote that they only use handguns. Check out this precedence:
A soldier whose role is using artillery is a "gunner".
A sailor responsible for a ship's cannons is a "gunner".
And a member of an aircrew operating a machine gun or auto-cannon is a "gunner".
Bonus: a Guns N' Roses fan is called a Gunner. And we all know that any red-blooded turret-rider is humming "Welcome to the Jungle" while they blow WD pirates out of the sky.