The 29th Infantry Brigade headquarters was converted and redesignated from the 120th Signal Support Company on 15 January 1959 at Fort Ruger.

A separate brigade, the 29th replaced the 299th Regimental Combat Team under the Pentomic reorganization as the major unit of the Hawaii Army National Guard.

The brigade included the 1st and 2nd Battle Groups of the 299th Infantry, formed from the 299th Regimental Combat Team, and the 284th Transportation Company (Light Truck).

[2][3][4] The 120th Signal Support Company, constituted on 15 September 1953, had been organized and Federally recognized on 4 January 1954 at Fort Ruger.

[6] The 29th Infantry Brigade Combat Team is the largest unit in the Hawaii Army National Guard (HI ARNG).

The brigade has units located on the islands of Hawaii, Maui, Oahu, Molokai, and Kauai, and in the states of Arizona, and California.