 The first paragraph in the passage foreshadows which theme of "Sea Legs"?
SEA LEGS By FRANK QUATTROCCHI Illustrated by EMSH Rootless and footloose, a man in space can't help but dream of coming home. Flight Officer Robert Craig surrendered the tube containing his service record tapes and stood waiting while the bored process clerk examined the seal. "No specific destination," supplied the man as he punched a key on a small instrument, "Air-lock ahead and to your right. "Place your clothing in the receptacle provided and assume a stationary position on the raised podium in the center of the lock." Craig obeyed the robot voice and began reluctantly to remove his flight jacket. "Insert your right arm into the instrument on the central table," commanded the same voice he had heard before. "No, but my father—" "Your parents left Terra during the Second Colonization of Cassiopeia II, didn't they?" He was uncomfortable; Wyandotte seemed to know all about him. Your body is conditioned to a normal state of free fall, or at best to a state of acceleration." Once on Gerymeade...." It helps suppress certain physiological reactions to an entirely new set of conditions. "Do you know what sailors of ancient times meant by 'sea legs?'" asked Wyandotte. "Men on a rolling ocean acclimated themselves to a rolling horizontal. They had trouble when they went ashore and the horizontal didn't roll any more. A port city was a frightening thing to an old sailor—but let's begin our little job at the beginning. Through the ports of the headquarters base satellite, he scanned the constellations for the scores of worlds he had visited during his eleven years in space. He had weathered difficult landings on worlds with rip-tide gravities, had felt the pull of the incredible star-tides imparted by twin and even triple star systems. But even if he could accept the psychologist's authority for the cumulative effect of a gravity system, he could not understand the unspoken warning he felt underlying all that the man said. "Yet you are so completely sure you will want to live out your life there, that you are willing to give up space service for it." On the eighth day, two attendants, who showed the effects of massive doses of PON to protect themselves from the centrifugal force, had to carry a man out of the tank. Many others asked to be removed, begged to be allowed to withdraw their resignations. "The twelfth day is the worst," a grizzled spaceman told Craig. "How ... how do they know when you ought ... to come out?"
 People shouldn't count on places to stay the same
 Society tends to neglect those who have served  If you don't like it, you can always leave  The grass is always greener on the other side  People shouldn't count on places to stay the same