Vigilance

Vigilance is a talented warrior ability, available at level 75. It is a 12 second buff cast on a friendly player.

Tips and tactics
Vigilance is best put on either a healer or damage dealer which produces the most threat. It helps to have a threat-tracking addon or, if the party members don't have one, a damage meter addon so you can determine which party or raid member is producing the most threat. This will make Taunt always ready if the member with highest threat outdo yours.