Lunar pioneers will encounter hazards and crises requiring new emergency procedures. Here, an antenna installer fell over a 90-foot escarpment and fractured his right femur. Responding to this situation on a 'medivac' hopper, two other lunar base crew members employ a portable CAT-scan device, a holographic display, and helmet-mounted heads-up displays to determine the severity of the injury. After an inflatable Thompson splint is placed on his leg, the semiconscious technician is transported back to the base strapped onto the side of the hopper.