Army - 155th Brigade Combat Team Operation Iraqi Freedom with Unit Insignia MugThe 155th Armored Brigade Combat Team is a brigade combat team of the Mississippi Army National Guard. The brigade was formed in 1973 as the separate 155th Armored Brigade from the 1st Brigade, 30th Armored Division during a National Guard reorganization. It became the 155th Armored Brigade Combat Team following the 2006 United States Army reorganization into modular brigade combat teams.