 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. Craig obeyed the robot voice and began reluctantly to remove his flight jacket. "No, but my father—" "Your parents left Terra during the Second Colonization of Cassiopeia II, didn't they?" 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. 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. "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