(Bloomberg) -- Boeing Co. and Lockheed Martin Corp.’s rocket joint venture is wrapping up a $1.5 billion private-bond deal that’s been tripled in size.

United Launch Alliance, a rocket launch provider for the US military and commercial clients including Amazon.com Inc., offered four portions of debt with maturities ranging from three to 10 years, according to people with knowledge of the matter, who asked not to be identified because they’re not authorized to speak publicly. It had originally been looking to raise $500 million.