Launch of Alan Shepard On Mercury-Redstone 3 Freedom 7

May 5, 1961 9:34am EST The formal countdown for the preparation for launching MR-3 started on the day previous to launch day. The countdown was actually split into two parts because previous experience had shown that it was preferable to run the countdown in two shorter segments and allow the launch crew of both the spacecraft and the launch vehicle to obtain some rest before starting the final preparation. The countdown started at 8:30am EST on May 4, 1961. All operations proceeded normally and were completed ahead of schedule. A build-in hold of approximately 15 hours was called at T-6 hours 30 minutes. During this time the various pyrotechnics were installed in the spacecraft and the hydrogen peroxide system was serviced.
The countdown was resumed at T-6 hours 30 minutes at 11:30pm EST on May 4, 1961. A built-in hold of 1 hour had been previously agreed upon at T-2 hours 20 minutes. This hold was to assure that spacecraft preparations had been completed before the astronaut was transported to the pad. The countdown proceeded with only minor delays until T-2 hours 20 minutes. At this time, final preparation of the spacecraft was conducted and the astronaut was apprised of the continuance of the countdown and transported to the Pad. The countdown was continued after the hold at T-2 hours 20 minutes and, except for some minor holds, the countdown continued until T-15 minutes. At this time it was determined that photographic coverage of the launch and flight could not be obtained because of low clouds near the launch area. Weather forecasters predicted that visibility would improve rapidly within 20 to 45 min. During this time, one of the 400hz power inverters to the launch vehicle had regulation problems. The count was recycled to the T-35 minute and holding mark and the count picked up 86 minutes later after the replacement of the inverter.

Again at T-15 minutes it was necessary to hold the count again to make a final check of the real-time trajectory computer. The countdown then picked up and proceeded until liftoff at 9:34am EST on 5/5/1961.

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[FranklinParkIL]

from Wikipedia in part;

On May 5, 1961, Shepard piloted the Freedom 7 mission and became the second person, and the first American, to travel into space. He was launched by a Redstone rocket staying on a ballistic trajectory—a 15-minute suborbital flight which carried him to an altitude of 116 statute miles (187 km) and to a splashdown point 302 statute miles (486 km) down the Atlantic Missile Range.

Our entire grade school watched this live in the auditorium on a B&W TV. Historic!