Where can you find the values necessary to calculate the correct CHECKSUM?

The correct choice indicates that the values necessary to calculate the CHECKSUM can be found both on the ATG (Antenna Transmitter Group) inside the SIU (System Interface Unit) and on the back side of the antenna array. This means that when performing maintenance or troubleshooting, technicians can refer to these locations to gather the critical numerical data required for precise calculations, ensuring the integrity and functionality of the Air Defense Battle Management System.

Finding the CHECKSUM values in these two distinct locations is essential because each may provide different parameters relevant to the system's operation. Having access to both sources allows for cross-verification and ensures that the values being used for computations are accurate and up to date, which is vital for system performance and reliability.

The other locations mentioned in the question, such as the User Manual, may provide procedures or guidelines but do not specifically contain the numerical values needed for CHECKSUM calculations.