text: Signal Support by Army Echelon, Core Competencies, Training, and the Army Network
  2-221. A realistic training environment provides operators practice securing the DODIN-A against active
  threat and allows units to integrate actions and effects in support of maneuver commanders. Training signal
  forces to secure the network against an active threat is critical to mission success. Realistic and combat-
  focused training requires specialized technical training, instrumentation, and ranges at home station and
  combat training centers.
  Digital Battle Drills
  2-222. Digital battle drills provide signal equipment operators and teams structured, pre-planned responses
  to network, COMSEC, cybersecurity, or server-related events or power outages. Established standards are
  easy to enforce and help manage expectations inside the command. Realistic training and repetition ensure
  operators can reflexively apply conditioned responses under combat conditions. All echelons should
  formulate and actively rehearse battle drills for a variety of anticipated events to ensure timely and
  appropriate responses.
  Combined Arms Training Strategy
  2-223. The signal company’s training calendar should include events from the combined arms training
  strategy. These training events progressively build from team level through multi-echelon exercises
  supporting the parent unit. The combined arms training strategy begins with team tasks to develop crew
  proficiency installing and operating their assigned systems. As training progresses, teams combine for
  platoon- and company-level training exercises to ensure the teams can integrate the unit’s network systems
  into the DODIN-A. Training signal teams to proficiency through the combined arms training strategy ensures
  Soldiers are not only proficient in their individual military occupational specialty skills, but can integrate the
  network to support operations.
  SIGNAL DIGITAL MASTER GUNNER COURSE
  2-224. The Signal Digital Master Gunner Course is a functional course that trains signal noncommissioned
  officers to install, operate, maintain, and secure local area networks and integrate them with mission
  command information systems and the unit’s portion of the DODIN-A. The course teaches Soldiers to
  integrate commercial server applications with tactical communications systems. Signal digital master gunner
  is a resident course taught at the Signal School.
  SECTION IV – THE ARMY NETWORK
  2-225. Army forces depend on the DODIN-A for network-enabled operations throughout all operational
  phases and environments. This section discusses the joint (DODIN) and Army (DODIN-A) networks, the
  network transport and information services capabilities that enable command and control, and DODIN
  operations.
  DEPARTMENT OF DEFENSE INFORMATION NETWORK
  2-226. The joint force depends upon the DODIN to connect strategic, operational, and tactical commanders
  across the globe. The DODIN enables the right users to access the right information at the right time to enable
  situational understanding and timely decision making, with the right protection to prevent disclosure to
  enemies and adversaries.
  2-227. As the DOD portion of cyberspace, the DODIN interacts with and provides connections to national
  and global cyberspace. The DODIN consists of joint capabilities provided by the Defense Information
  Systems Agency combined with Service-specific enclaves provided by the Army (DODIN-A), Navy, Air
  Force, and Marine Corps. An enclave is a set of system resources that operate in the same security domain
  and that share the protection of a single, common, continuous security perimeter (CNSSI 4009).
  2-228. The DODIN can store user data or make data stores available through commercial cloud service
  providers. The Defense Information Systems Agency manages DISN applications and services through core
  data centers in each geographic combatant commander’s area of responsibility. The servers at the core data