THIS DAY IN HISTORY: Apollo AS-203 Launches From Kennedy Space Center On July 5, 1966
By NASA // July 5, 2026
mission was an uncrewed test of the vehicle’s second stage
BREVARD COUNTY, FLORIDA — On this day in 1966, NASA launched the Apollo AS-203 mission from Kennedy Space Center, marking a key milestone in the development of the Saturn rocket program that would eventually carry astronauts to the Moon.
Unlike later Apollo missions, AS-203 did not carry a crew. Instead, the mission was designed to test the Saturn IB rocket’s S-IVB second stage and the Saturn V instrument unit under orbital conditions. Engineers used the flight to gather critical data on how the rocket stage performed in space, helping pave the way for future crewed Apollo missions.
The Saturn IB used for the mission was configured to closely match the design of the larger Saturn V rocket, allowing NASA to evaluate systems that would later be used during the Apollo lunar missions.
NASA’s Marshall Space Flight Center led the design, development and production management of both the Saturn I and Saturn V launch vehicles. The Saturn V would go on to become the rocket that carried astronauts to the Moon during the Apollo program, including the historic Apollo 11 mission in 1969.
Today, Marshall continues its legacy of deep-space exploration by developing NASA’s Space Launch System (SLS), the most powerful rocket ever built. The SLS is designed to support NASA’s Artemis program, returning astronauts to the Moon and laying the groundwork for future human missions to Mars.
The Apollo AS-203 mission remains an important chapter in NASA’s history, demonstrating the critical testing and engineering advances that made lunar exploration possible and continue to influence spaceflight today.
(NASA) –
ABOVE VIDEO: The launch of Saturn 1B AS-203 on July 5, 1966, from Cape Canaveral Kennedy Space Center Launch Complex 37B.
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