The twelve stared at him, openmouthed. For six years they had been taught to rely on scientific methods. Now their best instructor and senior officer was telling them just the opposite! Rip started to object, but then he caught a glimmer of meaning. He stuck out his hand. "Thanks, Joe. I hope we'll meet again." Barris grinned. "We will, Rip. I'll ask for you as a platoon commander when they assign me to cleaning up the goopies on Ganymede." This was the major's idea of the worst Planeteer job in the solar system. The group shook hands all around; then the young officers broke for the door on the run. The Terra rocket was blasting off in five minutes, and they were to be on it. Rip joined Flip Villa, and they jumped on the high-speed track that would whisk them to Valve Two on the other side of the platform. Their gear was already loaded. They had only to take seats on the rocket, and their six years on the space platform would be at an end. "I wonder what it will be like to get back to high gravity," Rip mused. The centrifugal force of the spinning platform acted as artificial gravity, but it was considerably less than Earth's. "We probably won't be able to walk straight until we get our Earth legs back," Flip answered. "I wish I could stay in Colorado with you instead of going back to Mexico City, Rip. We could have a lot of fun in eight weeks." Rip nodded. "Tough luck, Flip. But anyway, we have the same assignment." Both Planeteers had been assigned to Special Order Squadron Four, which was attached to the cruiser _Bolide_. The cruiser was in high space, beyond the orbits of Jupiter and Saturn, doing comet research. They got off the track at Valve Two and stepped through into the rocket's interior. Two seats just ahead of the fins were vacant, and they slid into them. Rip looked through the thick port beside him and saw the distinctive blue glow of a nuclear drive cruiser sliding toward the platform. "Wave your eye stalks at that job," Flip said admiringly. "Wonder what it's doing here." The space platform was a refueling depot, where conventional chemical fuel rockets topped off their tanks before flaming for space. The newer nuclear drive cruisers had no need to stop. Their atomic piles needed new neutron sources only once every few years, and they carried thousands of tons of methane, compressed into solid form, for their reaction mass. The voice horn in the rocket cabin sounded. "The SCN _Scorpius_ is passing Valve Two, landing at Valve Eight." "I thought that ship was with Squadron One on Mercury," Rip recalled. "Wonder why they pulled it back here." Flip had no chance to reply, because the chief rocket officer took up his station at the valve and began to call the roll. Rip answered to his name.