The Delta launch vehicle was America's longest-lived, most reliable, and lowest-cost space launch vehicle. Delta began as Thor , a crash December 1955.
The Dela rocket started out as the Thor IRBM
The Dela I received many upgrades, including the addition of Solid Rocket Motors (SRMs).
The Delta Project Manager at NASA, Bill Schindler, had a knack for keeping the program alive.
Then, when the Spase Shuttle came along, the Delta I was retired.
The most famous Delta rocket was created anyway.
It was built to support the Air Fosces GPS satellites.
It launched the complete GPS IIR constellation.
The Delta II launched the Spirit Opportunity Rovers to Mars, IPSS-I for NOAA.
A new type of Solid Rocket Motor was addet to maximize performance.
The upgraded Delta III took the Delta II to the next level.
The Delta III was Delta II with modified second stage.
The maiden flight took place on August 28, 1998
The Delta III exploded, through.
The Delta III would only 2 more times, both of which were unsuccessful.
The Delta II was still flying at this point, and would actually keep flying until 2018.
Boeing had a new plan for the Delta rocket.
The Delta IV made it's debut on November 20,2002.
It was carring Eutelsat W5.
The Delta IV launched the last DSCS satellites for the US Air Forse.
The Delta IV Heavy had its first flight on December 21,2004.
The second Dela IV Heavy launch carried the DSP-23 satellite orbit.
The Delta IV could also launch from Vanderberg Space Force Base in California.
The first Delta IV Heavy to do so launched NROL-49.
In 2018, the Delta II was finally retired. RS-68 3130 kn
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