“But the tag says—”

“The tag lies like a rug, chum, but don't let it throw you. You're an early bird, ain't you?” He put down the tray. “It happened all the time, back at the beginning; they rushed them through fast and made some mistakes. I'll bet one guy out of every twenty is walking around with the wrong type on his tag — or pushing up flowers. Sloppy work, but you can't help it. Only trouble is, if you ever need a transfusion in a hurry and they pump the wrong kind into you — bingo.”

“Maybe it changed,” Gary suggested. “It was a long time ago.”

“Nope.” The soldier shook his head and grinned at Gary's ignorance. “It never changes, no more than fingerprints. You was born with O and you'll die with O. Now eat up. I'll bring in water and a can pretty soon; you're stuck here until the tests prove out. Two or three days maybe.”

“What for?” he asked again. “Why the tests?”

“To see if you picked up anything, stupid. If you're carrying any plague germs around, we'll soon know it.” He backed away. “And I'll earn that damned medal.”

“That's a hell of a note. Listen — do me a favor. Put in for a pass for me. I've been out of circulation too long.”

“A pass he wants yet!”

* * *

Gary didn't get the pass — he never waited for it, never waited out the three days. He knew with certainty what those tests would reveal, knew beyond doubt that the test tubes or whatever things they used would point to his two years of wandering around the quarantined land, would shout what must be in his blood. Freedom was too near to wait three days.