The Advanced Launch System (ALS) is a joint United States Air Force (USAF) and National Aeronautics and Space Administration (NASA) study which operated from 1987 to 1990. Its aim was to develop a flexible, modular, heavy-lift, high rate space launch vehicle that could deliver payloads to Earth orbit at a tenth the cost of existing boosters.
The Advanced Launch System (ALS) is a joint United States Air Force (USAF) and National Aeronautics and Space Administration (NASA) study which operated from 1987 to 1990. Its aim was to develop a flexible, modular, heavy-lift, high rate space launch vehicle that could deliver payloads to Earth orbit at a tenth the cost of existing boosters.
Source: Wikipedia "Advanced Launch System" · CC BY-SA 4.0
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