Answer: The correct answer is : In the Post-Civil War
Explanation: The Signal Corps is a division of the Army Department that is responsible for establishing and managing communications systems for the command of the combined armed forces. The signal support also includes design, installation, networks using single-channel and multichannel satellites, terrestrial microwaves, switching, messaging, video conferencing. The body of signals is commonly one of the first to enter into conflict, they may also be the first to support humanitarian missions.