The key point to the story will be Clinton's ban of guns on bases did not prevent this random loons murder intentions. Now, government will probably pass regulations that even base security (the marine/sailor at the gate) can't have a weapon/gun.
NOB Navy base is a huge base it is a city within itself. Crap happens. I knew of a sailor that snuck off the amphib base on duty on board his ship and wrapped a telephone cord around his wives neck and killed her because the phone bills showed she cheated on him while he was deployed.
Sadly this stuff just happens. I hope no gun regs come out of this.