The 55th Sustainment Brigade has a permanent organization of three attached battalions, one finance detachment and one signal company, however this number can be changed when the unit is deployed in a theater of operations.

These permanent attachments include: The 55th MMCs Lineage began with the creation of the 435th Highway Transport Command (HTC) in 1954.

The 55th MMC was assigned to the 310th Logistical Command at the John Singleton Mosby United States Army Reserve Center, Fort Belvoir, Virginia.

Colonel Mosby's Rangers operated primarily in the Northern Virginia area often disrupting the logistical supply lines of the Union Army.

During the late 1950s, his exploits received wide publicity as the result of the weekly television series "The Gray Ghost".

For two decades, the 55th MMC's training prepared the soldiers to augment the 200th Theater Army Materiel Management Center (TAMMC) in Zweibruecken, Germany.

In support of the U.S. Army transformation objective and to ensure the ability to perform its wartime mission in non-linear, non-contiguous operational environments, the 55th MMC converted to the 55th Sustainment Brigade on 16 September 2006.

A-1-888) Description A Silver shield shaped device 1+1⁄8 inches (2.9 cm) in diameter blazoned as follows: Per fess, the chief per pale Gules (Brick Red) and Buff, the base Azure (Dark Blue), a key ward upward and outward and a wrench in saltire Argent (Silver Gray), overall a dagger palewise point up of the last.

The following colors and images depict the organizational lineage combined to form the Fifty-fifth Sustainment Brigade: Brick red signifies Transportation, Crimson (red) for Ordnance, Dark Blue for the Adjutant General Corps, the wrench suggests maintenance support and the key denotes the unit's control of military supplies by the Quartermaster Corps.

Description A silver color metal and enamel device 2 inches (5.1 cm) in width consisting of a design similar to the shoulder sleeve insignia.

From 8 July 1996 through 3 February 1997, a seventy-person cell from the 55th MMC was mobilized for active duty to support the United Nations Peacekeeping mission in Bosnia.

completed over 3,225 combat logistics patrols, drove over 6,800,000 miles, processed over 7500 transportation movement requests, and partnered with the 8th Iraqi Army and Kirkush Location Command to improve Iraq's military drive towards self-sustainment.

[2] On 4 April 2014, the 55th Sustainment Brigade concluded their nine-month tour in Afghanistan, showcasing their important role in bringing basic logistical needs to the battlefield.

The 55th SBDE played a large, behind-the-scenes role in helping to improve the supply and record keeping capabilities, among other logistical areas, of the ANSF.