#command module

On the Apollo missions, the lunar module was in a compartment stage beneath the command module engines. Once the ship had reached a certain distance, that stage would separate and free the lunar module.

The command module would then dock with the lunar module. The spacecraft then continued on to lunar orbit in thesis configuration.

Upon arrival at the separation point, two astronauts would crawl through a pressurized tunnel from the command module into the lunar module. The third astronaut remained in the command module, orbiting above the moon.

The lunar module then separated and proceeded to its landing point. The lunar module (or LEM - Lunar Excursion Module, as it was referred to at this point) became home for the two astronauts during their brief stay on the moon.

-Apollo 11 stayed 21 hrs 36 mins

-Apollo 12 stayed 31.6 hrs

-Apollo 13 never landed

-Apollo 14 stayed 33 hrs

-Apollo 15 stayed 67 hrs

-Apollo 16 stayed 71 hrs

-Apollo 17 (the last men on the Moon) stayed just seconds shy of 75 hrs.

For departure the top half of the LEM, or ascent stage, would fire its rockets and ascend into lunar orbit to rendezvous with the command module. The descent stage was left behind on the lunar surface.

Once the ascent stage had docked with the command module the astronauts would transfer back. The ascent stage was then jettisoned, and all three astronauts rode the command module back to Earth to splashdown somewhere in the ocean.

"Apollo Command Module CSM-007A near NASA's MV Retriever in the Gulf of Mexico, during a manned 48-hour Apollo Block II Command Module postlanding systems qualification test."

CM-007 was delivered to NASA in 1966. After serving as a ground test vehicle, CM-007 was modified in 1967 for use in water-survival training as CM-007A. As part of their training, the astronauts inside the capsule were dropped into the Gulf of Mexico by a crane from an aircraft carrier to simulate the force of splashdown. Apollo crews also trained for extended recovery by remaining at sea for several days at a time in the Command Module. Such training prepared astronauts for the possibility of a splashdown far from the planned recovery site.

Date: April 5, 1968

Reaction control system (RCS) firing on the Apollo Command Module to maneuvers it into position before reentry.

Date: 1967

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