Those are both great concepts similar to the HUD on a fighter jet but having worn a HoloLens before they'd have to make significant hardware enhancements for it to be remotely practical to wear in combat. They're chunky, have poor field of view, poor brightness and contrast, require substantial power and compute capacity to be towed along.
What compute capacity? The compute device is in the headset, it's a self-contained unit and runs off of a 15W USB charger, with 2 hours of internal battery.
