The first Lockheed Martin Atlas 3A rocket is assembled at Cape Canaveral's pad 36B earlier this year for the inaugural launch. The work began when the Atlas booster stage was erected on the pad, followed by the addition of Centaur. A "wet dress rehearsal" was then performed in which the rocket was fueled during a mock countdown. Source video: Lockheed Martin (500k, 1min 16sec QuickTime file).