From the preview page of our new codex, you can find this cool blurb about other Wings of the Unforgiven Wings of the Unforgiven Most of the Unforgiven Chapters follow the Dark Angels' pattern of organization, including having formations similar to the Deathwing and the Ravenwing, although they are not named as such. For instance, Angels of Redemption have the Redwings, their 1st and 2nd Companies, while the Angels of Vengeance have a Terminator-armored company known as the Dreadwing and a mobile Raptorwing to carry out the hunt for the Fallen. All have performed admirably, but none have gained the recognition of the Deathwing and the Ravenwing.
Like the Dark Angels, the Unforgiven successor Chapters also have a clandestine group who possess knowledge of the Fallen and of the true events that occurred on Caliban. In the Guardians of the Covenant, their Inner Circle is known as the Secret Order, while that of the Angels of Absolution is called the Hidden Brotherhood.