When aircraft penetrate the outer boundary of an ADIZ on a track towards the US, how should aircraft movement messages be transmitted?

The correct approach for transmitting aircraft movement messages when penetrating the outer boundary of an Air Defense Identification Zone (ADIZ) is through Region Air Operations Center / Air Defense Sector data communication equipment. This method is specifically designed for efficient and secure communication between military and air traffic control authorities.

Using this type of communication ensures that the data is relayed quickly and accurately, which is essential for maintaining situational awareness and ensuring safety within the airspace. The data communication equipment employed by the Region Air Operations Center or the Air Defense Sector is equipped to handle the specific needs of military operations, including real-time updates and relevant strategic information regarding aircraft movements.

In contrast, the other methods do not provide the same level of integration or immediacy required in this context. Phone calls, while useful, may introduce delays and potential for miscommunication, especially in a fast-paced operational environment. Direct military communication links can be effective but may lack the broad operational oversight that data communication systems provide. Lastly, using fax to communicate with the control tower would be outdated and inefficient for the rapid information exchange needed for air defense operations. Therefore, the most appropriate and effective method is through Region Air Operations Center / Air Defense Sector data communication equipment.