The Taliban attack is not a success regardless the number. The Taliban choose the most vulnerable unarmed soldiers during prayers, their most vulnerable time. It was in retaliation for the USA bomb strike to destroy tunnels.

Every soldier should be armed from the time they are enlisted.

Regardless of the lack of Americans killed, this was a Green On Blue Attack. There were spies and traitors within the ranks. I find it interesting the media knows there were four traitors in the ranks immediately after the attack, but, not before.