Most of the 'Halo' series will be backward compatible on Xbox One soon
Halo: Reach Headlines Next Batch of Xbox 360 BC Games on Xbox One
IGN - Microsoft made 76 more original Xbox and Xbox 360 games backwards compatible on Xbox One and Xbox Series X
Four Halo games are coming to Xbox One Backward Compatibility later this year - Neowin
4K Xbox 360 Games Tested on Xbox One X! Halo 3, Gears 3, Fallout 3, Assassin's Creed + More
Xbox Makes 76 More Games Backwards Compatible - IGN
Microsoft is finally done with Xbox backwards compatibility
343 Industries is halting online services for Xbox 360 Halo games starting January 13
Somewhere In An Alternate R/halo, 40% OFF
Halo 5 Headlines Greatest Holiday Games Lineup in Xbox History - Xbox Wire
Halo 3, Halo 3: ODST Campaign Edition, Halo 4, Halo: Combat Evolved Anniversary added to Xbox One backward compatibility
Major Halo Update Includes Backward Compatibility And Xbox One X Support