Ortner was one of nine Jewish men who attended a one-day course on Tuesday at the privately owned Cherev Gidon Israeli Tactical Defense Academy near Scranton, Pennsylvania, a class that was scheduled on Sunday in response to the Pittsburgh synagogue attack.

He was there to learn how to use a gun to protect himself and his community and prevent a repeat of Saturday’s massacre, the deadliest targeting Jewish people in U.S. history.
Good for them.

You also have, of course, the standard comment/complaint:
Rabbi Moti Rieber, executive director of the Kansas Interfaith Action, an advocacy organization, said on Tuesday that he did not believe Trump’s call for more armed guards could prevent attacks on places of worship. 

“What kind of country we’re going to be if every house of worship has to have an armed guard?” Rieber said. “I think having less access to that kind of weaponry is going to be much more effective in the long run than having a single armed guard.”
"Let's make all honest people unarmed targets, because the people planning mass murder will have to disarm!"  Yeah, that works; murderers and terrorists are always so careful to obey gun laws...

Despite such noise, lots of honest people, Jews in this case, have decided "I can't sit there, hiding and hoping, while waiting for the cops to get here."  I wish them well.