• Two batteries in the ascent stage
• Four batteries in the descent stage
• A new power distribution system
• Active cooling for the descent batteries and electrical control assemblies

Eight days later, at its static facility in Santa Susana, California, North American first fired the S-II, intermediate stage of the Saturn V. The event was chronicled as the "second major Saturn V milestone" during April. Additional Details: First clustered firing of Saturn V's first stage. References: 16.

The probe entered the atmosphere at a speed of 40,877 km (25,400 mph) and generated temperatures of about 11,206K (20,000 degrees F). Data on heating were transmitted to ground stations throughout the descent. Thirty-two minutes after the launch - and but six minutes after the Antares was fired - the device impacted in the Atlantic about 8,256 km (5,130 mi) southeast of the Cape. References: 2.

• Ascent stage - 2,193kg (4,835lbs)
• Descent stage - 2,166kg (4,775lbs)
• Total LEM (fueled) - 14,515kg (32,000lbs)

General Electric would update the LLRV CF-700 jet engines at their Edwards AFB facility rather than at Lynn, Mass. The change in work location would mean an earlier delivery date and a significant cost reduction. The updating would make the engines comparable to the production engines and would add an additional 890 newtons (200 lbs) of thrust. References: 16.

The space walk was hurriedly included after the Russian first in Voskhod 2. White seemed to have a lot more fun than Leonov and McDivitt took the pictures that came to symbolize man in space. With this flight the US finally started to match Russian flight durations. References: 2, 6, 16, 26, 33,60.