The 39th Infantry Brigade Combat Team, also officially known as The Arkansas Brigade, is an infantry brigade combat team of the Army National Guard composed of personnel from the U.S. states of Arkansas, Missouri, and Nebraska. The unit is the largest Army National Guard command in Arkansas and is headquartered at the Camp Robinson Maneuver Training Center. It was ordered into federal service in 2003 in support of Operation Iraqi Freedom II. The 39th was attached to the 1st Cavalry Division and served in and around Baghdad for a year, returning to the United States in March 2005.

The Army National Guard (ARNG), in conjunction with the Air National Guard, is an organized militia force and a federal military reserve force of the United States Army. They are simultaneously part of two different organizations: the ARNG of each state, most territories, and the District of Columbia, as well as the federal ARNG, as part of the National Guard as a whole. It is divided into subordinate units stationed in each state or insular area, responsible to their respective governors or other head-of-government.