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[i]Delta II, its design started in the 50s and 60s and it got upgrades through the years. The version we fly today was brought online in 1989. And then it had another update about 1995. So as you can see, it is already about 25 to 30 years old, technology-wise. It is the normal process in the launch industry to retire rockets after they have outgrown the technology of their day so we can advance rockets with new manufacturing techniques, lighter metals — the lighter the rocket is, the more payload you can launch. It is the normal course of events that rockets get retired.[/i]
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