WAC HUD is mostly use on Block 25, 30/32, 50/52/52.
Head Up Display
The Head-Up Display (HUD) is a semi-transparent screen positioned directly in front of the pilot’s line of sight. It projects critical flight data, such as altitude, speed, heading, pitch, and roll, onto the windshield, allowing the pilot to access essential information without diverting attention from the forward view. The display also integrates navigation data and weapon status information. Pilots can customize the information shown on the HUD using the Integrated Control Panel (ICP) and the HUD control panel. HUD is a part of Up Front Control along with Integrated Control Panel (ICP) and Data Entry Display (DED).