U.S. Army Signal Corps

The United States Army Signal Corps develops, tests, provides, and manages communications and information systems support for the command and control of combined arms forces. It was established in 1860, the brainchild of United States Army Major Albert J. Myer, and has had an important role from the American Civil War through the current day. Wikipedia*

On the C-SPAN Networks:
U.S. Army Signal Corps has hosted 1 event in the C-SPAN Video Library; the first program was a 1918 Vignette.