Final answer:
The communication system in question is the Situation Awareness Data Link (SADL), which links USAF aircraft with ground units for enhanced situational awareness.
Step-by-step explanation:
The communication system that integrates modified United States Air Force (USAF) close-air support aircraft with digitized battlefield information via Enhanced Position Location Reporting System (EPLRS) on their heads-up display, showing where Army/Marine/ground radios are located, is known as Situation Awareness Data Link (SADL). SADL provides real-time situational awareness and positioning information to both airborne and ground units, facilitating improved tactical data exchange. The main objective of SADL is to enhance the effectiveness of close-air support operations by providing pilots with direct access to the positions of friendly forces and targets on the battlefield.