Slitherine announces the release of U.S. Marines, a new DLC pack for Order of Battle that adds the armed force from the title to the World War II strategy game. You can pick this up on this page where there's also this launch trailer. Here's word on the pack:

Today Order of Battle, one of the most epic wargames of 2015 (81 Metascore, 89% of positive reviews on Steam, listed as best strategy game ever by PCGamesN), meets the U.S Marines corps in a brand new DLC.

Players are thrown into the adventurous island-hopping campaign of 1942-1945: a long and bloody military operation that started with the assault of Tulagi and advanced across small and isolated jungle islands, reaching up to the iconic epilogue at Iwo Jima.

Order of Battle: U.S Marines is the second expansion of the franchise and it includes a campaign with 11 brand new scenarios against the Imperial Japanese troops. Players fight, amongst others, the historical battles of Guadalcanal and Tarawa. In these savage landscape enemies adapt their strategy from ruthless assaults to deep and well-prepared defensive systems.

U.S. Marines faction has new units on its side and the new support fire ability for Heavy Infantry.