The U.S. Marine in the picture is about to repair a tracked vehicle. He is looking at a projected computer display, and there is a maintenance database in the computer at his belt.
A mouse wouldn't be practical, so menu selection is done with a rotary dial, and a pushbutton.
The picture actually shows a working ARPA prototype. The project is aiming for a family of products, weighing 2 to 4 pounds. Some will have a 1024 x 1024 color display, wireless data and audio communications, and speech recognition.