It seems to be a rare occurrence that the Pittsburgh Steelers do not tender their restricted free agents. Terence Garvin is the most recent, this year, and may have come as a bit of a surprise, considering some of the players that they have tagged in recent years.
Will Johnson, for example, got the tag last year. In 2013, both Jonathan Dwyer and Isaac Redman both received restricted free agent tags. Of course, part of the appeal of the tag is that their salary is not guaranteed if the player is released prior to the start of the season.