United States. Army. Signal Corps

Organized in 1860 under the leadership of Albert J. Myer, the U.S. Army Signal Corps began as the Army’s dedicated communications branch. It first became known for visual signaling during the Civil War, using flag and torch systems to send messages across long distances.

As military technology changed, the Signal Corps changed with it. It took on telegraphy, military telephone networks, radio, and later played a major role in aviation support, meteorology, and military photography and film. Over time, it became central to the Army’s ability to command forces, share intelligence, and coordinate operations.

The Signal Corps’ history is also a history of communication itself: a shift from hand signals to electronic networks, and from improvised field methods to highly specialized technical systems. That long evolution helps explain why the branch remains such an important part of how the Army operates.