Russell Clyde was the chief astrogator and astronomical expert. Assisting him was the rather pedantic and sober Samuel Oberfield, a mathematical wizard and astrophysicist, on leave from an assistant professorship at one of the great universities. Clyde and Oberfield would also act as copilots relieving Lockhart. Harvey Caton, blond Jurgen Detmar, and the jovial Frank Shea were the three-man engineering crew. Completing the members of the expedition was another trio chosen to act as general crew, medical and commissary men while in flight, and as a trained explorer-fighter unit while on planetside. Roy Haines, of whose exploits in Africa and the jungles of South America Burl Denning had heard, was the first of these, a rugged, weather-beaten, but astonishingly alert explorer. Captain Edgar Boulton, on leave from the United States Marines, was the second--a man who had made an impressive record in various combat actions in his country's service. The Antarctic explorer, Leon Ferrati, completed the listing. Ferrati was an expert on getting along in conditions of extreme frigidity and hostile climates. Of these men, only Lockhart, Clyde, Detmar and Ferrati had had space experience in the platforms and in Moon-rocketry. It was still, thought Burl, a large crew for a spaceship. No rocket built to date had ever been able to carry such a load. But by then he had realized that the strict weight limitation imposed by rocket fuels no longer applied to this new method of space flight. Burl found himself more and more anxious to see this wonderful craft. It was not until the morning of the second day that Burl's chance came. He had fallen asleep on the stiff army cot in the hastily improvised base on the Wyoming prairie where the final work was being done. The day had been a confused jumble of impressions, with little time to catch his breath. Now he had slept the sleep of exhaustion, only to be awakened at dawn by Lockhart. "Up and dress," the colonel greeted him. "We're taking you out to look the ship over. Detmar will come along and explain the drive." Burl threw his clothes on, gulped down breakfast in the company of the others at the messhall, and soon was speeding along a wide, new road that ran up to the mountains edging the wide western plain. As they neared the mountains, he saw a high wooden wall blocking the road and view; this was the barrier that concealed the ship nestled in the valley beyond. They passed the guards' scrutiny and emerged into the valley. The A-G 17 loomed suddenly above them, and Burl's first impression was of a glistening metal fountain roaring up from the ground, gathering itself high in the sky, as if to plunge down again in a rain of shining steel.