The Army’s Signal Corps is responsible for all communication systems for the entire Army. The 25A MOS is a Signal Officer. Signal Officers plan and execute all aspects of communication for a mission. They maintain the Army’s voice, data, and information systems.
They also:
Provide advice and technical direction to commanders and staffs
Make tactical decisions
Coordinate employment of Signal Soldiers at all levels of command
Develop doctrine, organizations, and equipment for unique Signal missions
Signal Officers must obtain and maintain a Top-Secret (TS) security clearance with Special Compartmented Information (TS-SCI) access.
Other MOSs in the Signal Corps include:
25 Sierras, which deal with satellite systems
25 Bravos, which deal with data management