Final answer:
The pilot's and copilot's PDU in the UH-60 A/L helicopter have been replaced with the Multi-Function Display (MFD) system.
Step-by-step explanation:
The pilot's and copilot's PDU in the UH-60 A/L helicopter have been replaced with the Multi-Function Display (MFD) system. The MFD is a digital screen that provides the pilots with important information such as flight data, navigation, and system status. It allows for easier and more efficient operation of the aircraft.