The 1108th Signal Brigade is a United States Army unit responsible for running much of the Raven Rock Mountain Complex and providing strategic communication support to the White House and the Joint Chiefs of Staff.

[2][3] It was based at Fort Ritchie, but was recommended to be transferred to Fort Detrick, Maryland during the 1995 Base Realignment and Closure.

[3][2][4] On 16 October 2003, the 1108th Signal Brigade at Fort Detrick, Maryland was re-designated the 21st Signal Brigade.

[5][6]