It mustered into Federal service on 18 February 1836, at Picolata, Florida, as "Captain Seymor's Company, 1st Battalion Georgia Volunteers".
The unit was drafted into federal service in August 1917 as Company B, 151st Machine Gun Battalion, an element of the 42nd Division.
It was inducted into federal service on 16 September 1940 at Macon, and was redesignated on 16 February 1942 as the 30th Cavalry Reconnaissance Troop while remaining assigned to the 30th Infantry Division.
[4] The conflict ended before the brigade could be employed in the Persian Gulf and It subsequently demobilized on 10 April 1991 at Fort Stewart.
Elements of the 48th Infantry Brigade deployed to Bosnia and Herzegovina for Stabilization Force (SFOR) Rotation 9 to provide support operations for Task Force Eagle (United States contingent to United Nations Operations in support of Dayton Peace Accord).
In October 2004, the 48th Infantry Brigade was notified that it would be mobilized into federal service in support of the Global War on Terrorism.
The brigade completed five months of training, including a rotation at the National Training Center, Fort Irwin, California and was validated as combat-ready.In May 2005, the unit began deploying to Iraq as part of Operation Iraqi Freedom III (the third major U.S. military rotation of forces into the area of operations) and experienced some of the fiercest combat actions in the campaign.
Elements of the 48th Brigade occupied and maintained forward operating bases (FOBs) in Mahmudiyah, Lutifiyah, Latifiyah, and Yusifiyah; and established a new joint United States/Iraqi Army permanent patrol base, designated PB Lion's Den, located to the west of the Radwaniyah Palace Complex.
The brigade's headquarters relocated to Camp Adder (also known as Ali Air Base or Tallil Air Base) in vicinity of Nasiriyah, Iraq, and the brigade had elements stationed as far south as Kuwait to as far north as Mosul, and as far west as the Syrian border.
On 20 April 2006, at Ft. Stewart, more than 4,000 members of the brigade began to return home after a year of combat operations in Iraq.
The 20 April arrival marked the first of nearly a dozen flights over the subsequent weeks that brought the soldiers back to Georgia.
In December 2007, the 48th Infantry Brigade Combat Team was alerted that it will be deployed to Afghanistan in the summer of 2009 in support of Operation Enduring Freedom (OEF).
The program established a formal relationship between reserve and active duty components, allowing units to train and eventually deploy together.