aeronautics

From http://www.nasa.gov/centers/goddard/home/index.html:

NASA's Goddard Space Flight Center is home to the nation's largest organization of combined scientists, engineers and technologists that build spacecraft, instruments and new technology to study the Earth, the sun, our solar system, and the universe.

From Wikipedia: Aeronautical Systems Center:

The Aeronautical Systems Center (ASC) is an Air Force product center that designs, develops and delivers dominant aerospace weapon systems and capabilities for U.S. Air Force, other U.S. military, allied and coalition-partner warfighters, in support of Air Force leadership priorities.