Not a Deterrent

Because you have a seventy year old reserve officer directing traffic in his uniform, albeit armed, as you are arriving for Yom Kippur at your shul and then leaving services, do not confuse that with actual defense against a terrorist attack. You would be better served if several congregants had training and used their concealed carry right to put an element of doubt into any possible attacker's head. "How many of these Jews are actually armed?" "How much resistance am I facing?" "Will I be martyred before I am able to kill some infidels"? That is the real protection, not old John Law, however nice he is and engaging with the congregants.