- Family: Atlas
- Length: 58.3 m
- Diameter: 3.81 m
- Launch Mass: 590 T
- Low Earth Orbit Capacity: 13490 kg
The Atlas V 521 was manufactured by United Launch Alliance with the first launch on 2003-07-17. Atlas V 521 has 2 successful launches and 0 failed launches with a total of 2 launches. Atlas V is the fifth major version in the Atlas rocket family. It is an expendable launch system originally designed by Lockheed Martin, now being operated by United Launch Alliance (ULA), a joint venture between Lockheed and Boeing.
Manufacturer

United Launch Alliance (ULA) is a joint venture of Lockheed Martin Space Systems and Boeing Defense, Space & Security. ULA was formed in December 2006 by combining the teams at these companies which provide spacecraft launch services to the government of the United States. ULA launches from both coasts of the US. They launch their Atlas V vehicle from LC-41 in Cape Canaveral and LC-3E at Vandeberg. Their Delta IV launches from LC-37 at Cape Canaveral and LC-6 at Vandenberg. United Launch Alliance is a Commercial USA entity that was founded in 2006 and is administered by CEO: Tory Bruno.
United Launch Alliance has 156 successful launches and 0 failed launches with a total of 156 launches.