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CAPE CANAVERAL (CBSMiami) - The second time was the charm for SpaceX which successfully launched a classified U.S. intelligence mission from the Kennedy Space Center Monday morning.

A sensor problem scrubbed the first attempted launch on Sunday. It was called off with just under a minute remaining in the countdown.

Monday morning, just after 7:15 a.m., a Falcon rocket successfully lifted off with the top-secret NROL-76 spy satellite.

Following separation, the Falcon 9's first stage returned to Earth and landed on SpaceX's pad at Cape Canaveral. This was a milestone for company founder Elon Musk in his effort to recover and reuse Falcon rockets.