Question: What was the number of folks on the support crew for Apollo 11?
About the article "Apollo 11", section "Support crew".

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Each crewman of Apollo 11 had made a spaceflight before this mission, making it only the second all-veteran crew (the other being Apollo 10) in human spaceflight history.
Collins was originally slated to be the Command Module Pilot (CMP) on Apollo 8 but was removed when he required surgery on his back and was replaced by Jim Lovell, his backup for that flight.
After Collins was medically cleared, he took what would have been Lovell's spot on Apollo 11; as a veteran of Apollo 8, Lovell was transferred to Apollo 11's backup crew, but promoted to backup commander. 
Mattingly had originally been assigned to the prime crew of Apollo 13, but was exposed to the measles through Duke, at that time on the back-up crew for Apollo 13, who had caught it from one of his children.
He never contracted the illness, but was nevertheless removed from the crew and replaced by his backup, Jack Swigert, three days before the launch.
Young, a captain in the United States Navy, had flown on three spaceflights prior to Apollo 16: Gemini 3, Gemini 10 and Apollo 10, which orbited the Moon.
One of 19 astronauts selected by NASA in April 1966, Duke had never flown in space before Apollo 16.
He served on the support crew of Apollo 10 and was a Capsule Communicator (CAPCOM) for Apollo 11. 
To reinforce the association with astronauts, Omega also began using the "Professional" appellation for existing Speedmaster models after Gemini 4.
In 1966, Speedmaster reference 105.012 was updated to reference 145.012.
These two models would be the two Speedmaster references known to have been worn on the moon by Apollo astronauts, the original "moonwatches."
Speedmasters were used throughout the early manned Apollo program, and reached the moon with Apollo 11.
Ironically, these and prior models are informally known as "Pre-moon" Speedmasters, since their manufacture predate the moon landings and lack the inscription subsequent models carry: "The First Watch Worn on the Moon".
Although Apollo 11 commander Neil Armstrong was first to set foot on the moon, he left his 105.012 Speedmaster inside the Lunar Module as a backup because the LM's electronic timer had malfunctioned.
Buzz Aldrin elected to wear his and so his Speedmaster became the first watch to be worn on the moon.
Later, he wrote of his decision:"It was optional to wear while we were walking on the surface of the moon ... few things are less necessary when walking around on the moon than knowing what time it is in Houston, Texas.
Nonetheless, being a watch guy, I decided to strap the Speedmaster onto my right wrist around the outside of my bulky spacesuit."
Aldrin's Speedmaster was lost during shipping when he sent it to the Smithsonian Institute; the reference number of the watch is not known for certain, though it is sometimes reported as a 145.012.
Speedmasters were carried by the crews of all subsequent Apollo missions, including American members of the Apollo-Soyuz Test Project (Soviet crew wore Omega Flightmasters).
In 1970, after Apollo 13 was crippled by the rupture of a Service Module oxygen tank, Jack Swigert's Speedmaster was famously used to precisely time the critical 14-second Mid-Course Correction 7 burn using the Lunar Module's Reaction Control System, which allowed for the crew's safe return.
In recognition of this, Omega was awarded the Snoopy Award by the Apollo 13 astronauts, "for dedication, professionalism, and outstanding contributions in support of the first United States Manned Lunar Landing Project.
"In 1971, Apollo 15 commander David Scott's issued Speedmaster lost its Plexiglas crystal during EVA-2.
For EVA-3, the final lunar surface EVA, In a 2011 interview, Colonel Scott stated that he wore a Bulova Chronograph watch, model number 88510/01, NASA Part Number SEB12100030-202 that he had agreed to evaluate for the company.
Because of the commercial interests involved and the revelation of the Apollo 15 postage stamp incident, NASA withheld Bulova's name for years afterward.
Therefore, while the Speedmaster was the first watch worn on the moon, it is not the only one, as Omega often claims on its watches and in marketing materials.
In addition to issued crew watches, Apollo 17 carried an additional Speedmaster to lunar orbit as part of the Heat Flow and Convection Experiment conducted by Command Module pilot Ronald Evans.
This watch was sold for $23,000 at a Heritage Auction in 2009. 
"Essex" was scheduled to be the prime recovery carrier for the ill fated Apollo 1 space mission.
It was to pick up "Apollo 1" astronauts north of Puerto Rico on 7 March 1967 after a 14-day spaceflight.
However, the mission did not take place because on 27 January 1967, the "Apollo 1"s crew was killed by a flash fire in their spacecraft on LC-34 at the Cape Canaveral Air Force Station, Florida.
"Essex" was the prime recovery carrier for the Apollo 7 mission.
She recovered the "Apollo 7"s crew on 22 October 1968 after a splashdown north of Puerto Rico.
"Essex" was the main vessel on which future Apollo 11 astronaut Neil Armstrong served during the Korean War. 
The original lunar plaque on "Aquarius" bore Mattingly’s name, so the crew was given a replacement with Swigert’s name on it.
"Aquarius" never landed on the Moon, however, so Lovell kept the plaque.
In his book "Lost Moon" (later renamed "Apollo 13"), Lovell states that, apart from the Apollo 13 plaque and a couple of other pieces, the only other memento he possesses is a letter from Charles Lindbergh.
The Apollo 13 crew patch featured three flying horses as Apollo's 'chariot' across space.
Given Lovell's Navy background, the logo also included the mottoes “"Ex Luna, scientia"” ("From the Moon, knowledge"), borrowed from the U.S.
Naval Academy's motto, ""Ex scientia tridens"" ("From knowledge, sea power").
The mission number appeared in Roman numerals as Apollo XIII.
It is one of two Apollo insignia—the other being Apollo 11—not to include the names of the crew.
(This was fortunate, considering that original crew member Ken Mattingly was replaced two days before the mission began.)
It was designed by artist Lumen Martin Winter, who based it on a mural he had done for The St. Regis Hotel in New York City.
The mural was later purchased by actor Tom Hanks, who portrayed Lovell in the movie "Apollo 13", and now is on the wall of a restaurant near Chicago owned by Lovell's son.