If your morality means that you laugh when evil things happen to people, I don’t want you to have a gun in service of the country, I don’t trust you. Luckily what you want is completely irrelevant. Government/military personnel enjoy the same constitutional protections as everyone else. Private employers can dictate their own policy regarding workplace speech etiquette, because the 1st amendment only protects you from government retribution, not private employer. Obviously, the government is not a private employer, and they can be sued for wrongfully discharging someone if constitutional rights were violated. And we get to pay for that.