The 1st Signal Brigade ("First to Communicate")[1] is a military communications brigade of the United States Army subordinate to the Eighth United States Army and 311th Signal Command in Hawaii, and located at Camp Humphreys in South Korea.

[2] The brigade's mission was to originate, install, operate, and maintain a complex communication system that fused tactical and strategic communications in Southeast Asia under a single, unified command.

[3][4] On 7 November 1972 the brigade was relocated to the Republic of Korea under the United States Army Strategic Communications Command.

[5] On 29 January 1973 the 1st Signal Brigade was reestablished by General Order 56 from HQ, USASTRATCOM.

The brigade was also given the mission of installing, maintaining and operating the Defense Communications System in South Korea.