Short answers, pulled from the story.
Engineers constructed the BP-9A boilerplate spacecraft to mimic the weight and shape of a real Apollo command module for structural testing. This dummy vessel lacked life support systems or crew quarters and served as a test bed for the Saturn I rocket's upper stages.
Lift-off occurred at 08:00 EST (13:00 GMT) on the 30th of July 1965. A thirty-minute hold ensured timing aligned with the opening of the Pegasus launch window before orbit insertion happened approximately 10.7 minutes after ignition.
The boilerplate spacecraft remained in orbit for over ten years before falling back to Earth. It reentered the atmosphere on the 22nd of November 1975, causing debris from the S-IV stage and adapter to burn up upon entry.
A 1423.6 kilogram micrometeoroid detection satellite called Pegasus 3 rode stowed inside the boilerplate service module. Engineers bolted this satellite directly to the S-IV stage where it measured tiny particles hitting the spacecraft while orbiting Earth.
NASA engineers built ten identical vehicles to validate the booster before moving to larger designs. The program concluded with this single flight after achieving all testing goals without sending humans into space yet.