Final answer:
JREAP extends military communication systems by transmitting tactical data over IP networks like SIPRNET, ensuring secure and reliable communication for classified information.
Step-by-step explanation:
The Joint Range Extension Application Protocol (JREAP) that transmits Tactical Data Link messages over Internet Protocol networks, such as the Secret Internet Protocol Router Network (SIPRNET), is a protocol used to extend the range of military communication systems. SIPRNET is a system of interconnected computer networks used by the U.S. Department of Defense and the U.S. Department of State to transmit classified information. JREAP allows for the secure transmission of tactical data over IP networks, enabling reliable communication across different platforms and services.