Units
Within each battalion are units that are assigned aboard ships, known as Marine Strike Groups or MSG, and non-assigned units, known as Marine Exploratory Units or MEU. Within Twelfth Brigade, there are the following active units:
12th Brigade Headquarters
- 200 MEU - 12th BDE Headquarters
Arkansas - First Battalion
- 245 MSG "Emperor's Guard", USS Sun-Tzu
- 275 MSG "Diamond Cutters", USS Blackstone
Illinois - Second Battalion
- 225 MSG "DedEx", USS Bortas
- 229 MSG "The Hunters", USS Orion
- 263 MSG "The Hawk's Talons", USS Black Hawk
Kansas - Third Battalion
- 222 MSG "Madd Dogs", USS Jeannette Maddox
- 250 MSG "The Berserkers", ISS Olympus
- 269 MSG "The Black Bettys", USS Dark Phoenix
- 299 MSG "Infinite Dragon", USS Ouroboros
Missouri - Fourth Battalion
- 201 MSG "The Fighting Wolfpack", USS Horizon
- 212 MSG "Odin's Fury", USS Odin
- 213 MSG "Umiak Targs", USS Umiak
Oklahoma - Fifth Battalion
- 234 MSG "Stray Dogs". USS Oklahoma
- 280 MSG "Buffalo Storm Wardens, USS Alan Turing
Brigade Strength
- Active: 75
- Reserve: 53
- Total: 128
- Units: 15