AP style update
AP style now calls for using "HOUSTON" as the dateline from the Johnson Space Center instead of "SPACE CENTER, Houston." Here's the full entry:
Lyndon B. Johnson Space Center
Formerly the Manned Spacecraft Center. Located in Houston, it is the National Aeronautics and Space Administration’s principal control and training center for manned spaceflight.
Johnson Space Center is acceptable in all references.
HOUSTON (AP) -
See John F. Kennedy Space Center.