Test Force.

The article reports on the flight testing of Lockheed Martin's F-35 Joint Strike Fighter (JSF). The first air-to-air refueling tests for the F-35 are planned to begin in March 2008, clearing the way for the eventual transfer of the first JSF demonstrators to Edwards Air Force Base in California. The start of aerial refueling trials, using the first aircraft (AA-1), marks a surge in activity for the JSF as it coincides with the planned installation of a replacement flight-test engine for the first short takeoff and vertical landing (Stovl) F-35B.