From Lexicanum

The 23rd Imperial Navy Bomber Wing contains Marauder^1a and Marauder Destroyer^1b bombers. One of its squadrons is known as Blackwing and it has taken part in the battles above Armageddon Prime^1a as well as Armageddon's Ash Wastes^1b

Sources

¹:Imperial Armour Volume One - Imperial Guard and Imperial Navy a:p233, b:p238