Atlas the rocket

The Atlas, first tested in 1959, was the United States' first successful ICBM (Intercontinental Ballistic Missile). It was a multistage, liquid-fueled (liquid oxygen and kerosene) rocket, with three engines which produced 162,000kg of thrust?.

Though never used in combat, it was used to launch the Mariner? space probes used to study Mercury, Venus, and Mars (1962-1973); and to launch all but the first two the Mercury missions (1962-1963). The Mercury missions resulted in the first American to orbit the earth (Lt. Col. [John H. Glenn Jr.]?) in February of 1962. (Major [Yuri A. Gargarin]?, a Soviet cosmonaut was the first human in orbit, in April of 1961.)