He had scouted for light infantry in the Coreward Bands Revolt. His machine then had been the size and shape of two hands cupping water, the hemispherical surface holed with dozens of carbon whisker fans, each of which could run at its own speed. He was deployed on the battlefield in those days, flying his craft through a VR helmet. He stayed with the platoon staff under their portable forcefield, wandering about blind to his surroundings. That had never set easy with him; he constantly imagined a slug finding him, the real world intruding explosively on the synesthetic realm inside his helmet. Marx was very good, though, at keeping his craft steady in the unpredictable Bandian winds. His craft would paint enemy snipers with an undetectable x-ray laser, which swarms of smart needle-bullets followed to unerring kills. Marx’s steady hand could guide a projectile into a centimeter-wide seam in personal armor, or through the eye-slit of a sniper’s camopolymer blind.

Later, he flew penetrators against Rix hovertanks in the Incursion. These projectiles were hollow cylinders, about the size of a child’s finger. They were launched by an infantryman, encased in a rocket-propelled shell for the first half of their short flight. When the penetrator deployed, breaking free the instant it spotted a target, it flew purely on momentum. Ranks of tiny control surfaces lined the inside of the cylinder, like the baleen plates of some plankton-feeder. The weapon’s supersonic flight was an exercise in extreme delicacy. Too hard a nudge and a penetrator would tumble uselessly. But when it hit a Rix tank just right, its maw precisely aligned to the hexagonal weave of the armor, it cut through metal and ceramic like a rip propagating down a cloth seam. Inside, the projectile disintegrated into countless molecular viruses, breaking down the machine in minutes. Marx flew dozens of ten-second missions each day, and was plagued at night with fitful microdreams of launch and collision. Eventually, backpack AI proved better for the job than human pilots, but Marx’s old flight recordings were still studied by nascent intelligences for their elegance and flair.

The last few decades, Marx had worked with the Navy. Small craft were now truly small, fullerene constructions no bigger than a few millimeters across when furled, built by even smaller machines and powered by exotic transuranium batteries. They were largely for intelligence gathering, although they had offensive uses. Marx had flown a specially fitted Intelligencer into a fiberoptic AI hub during the Dhantu Liberation, carrying a load of glass-eating nanos that had dismantled the rebel’s communication system planetwide within minutes.