Crouched in a desert trench somewhere in the Middle East, enemy bullets thudding into the sand just above his head, the wounded soldier checks his wrist-mounted thermometer. It’s a searing 43 degrees, and he’s been trapped there for two days with little water and no food at all.

Amazingly, he’s comfortable. A microturbine integrated into his battlesuit provides power for a highly effective microclimate air-conditioning system that maintains his body temperature at a safe level. A transdermal nutrient delivery system provides just enough nourishment to keep his body going. The pain of a leg wound sustained in a firefight two hours earlier has subsided to a dull ache.

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