Which message type cannot be implemented using JREAP?

JREAP, or the Link 16 Joint Range Extension Application Protocol, is designed to extend the range of Link 16 communications through various means such as satellite and terrestrial communications. Understanding the compatibility of different link types with JREAP is crucial for effective communication in joint operations.

Link 16 and Link 11B are data links that can utilize JREAP for their operations, allowing them to function effectively even over extended ranges. Link 11, while an older system, can also integrate with JREAP to enhance its performance.

However, Link 22 represents a newer and distinct tactical data link that is designed for advanced communications and interoperability in a joint environment. It was developed with features that are not compatible with JREAP. Since JREAP primarily serves to bridge existing Link 16 and Link 11 systems, it cannot implement Link 22 due to its unique architecture and design intents.

Thus, Link 22 stands apart from the other options as it is not a type that can be integrated or operated through the JREAP protocol, making it the correct choice in this scenario.