You should also know that the civil authority has the responsibility to protect their citizens
2321 The prohibition of murder does not abrogate the right to render an unjust aggressor unable to inflict harm.** Legitimate defense is a grave duty for whoever is responsible for the lives of others or the common good. **
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Public authorities, in this case, have the right and duty to impose on citizens the
obligations necessary for national defense. Those who are sworn to serve their country in the armed forces are servants of the security and freedom of nations. If they carry out their duty honorably, they truly contribute to the common good of the nation and the maintenance of peace.107.