Someone with the Knight subclass can use any weapon and a shield in battle.
According to the Elder Tale Nobility, an 'Order of Knights' is recognized as an official military force. A city that has such a force is considered a military asset, though the Round Table Alliance clearly stated that Akihabara has no such organization. This is not considered by the nobility when they demanded that the Adventurers send out troops to defeat the goblin hordes invading the continent.