Before becoming an astronaut, Armstrong was in the United States Navy and served in the Korean War.
After the war, he served as a test pilot at the National Advisory Committee for Aeronautics (NACA) High-Speed Flight Station, now known as the Dryden Flight Research Center, where he flew over 900 flights in a variety of aircraft. He graduated from Purdue University and the University of Southern California.
A participant in the U.S. Air Force’s Man in Space Soonest and X-20 Dyna-Sour human spaceflight programs, Armstrong joined the NASA Astronaut Corps in 1962. His first spaceflight was the NASA Gemini 8 mission in 1966, for which he was the command pilot, becoming one of the first U.S. civilians to fly in space. On this mission, he performed the first manned docking of two spacecraft with pilot David Scott.
Armstrong's second and last spaceflight was as mission commander of the Apollo 11 moon landing mission on July 20, 1969. On this mission, Armstrong and Buzz Aldrin descended to the lunar surface and spent 2½ hours exploring while Michael Collins remained in orbit in the Command Module. Armstrong was awarded the Presidential Medal of Freedom by President Richard Nixon along with Collins and Aldrin, the Congressional Space Medal of Honor by President Jimmy Carter in 1978, and the Congressional Gold Medal in 2009.
Neil Armstrong passed away following complications resulting from cardiovascular procedures. Upon his passing, his family said, "For those who may ask what they can do to honor Neil, we have a simple request. Honor his example of service, accomplishment and modesty, and the next time you walk outside on a clear night and see the moon smiling down at you, think of Neil Armstrong and give him a wink."
Armstrong's call-up from the Navy arrived on January 26, 1949, requiring him to report to Naval Air Station Pensacola for flight training. This lasted almost 18 months, during which he qualified for carrier landing aboard the USS Cabot and USS Wright. On August 16, 1950, two weeks after his 20th birthday, Armstrong was informed by letter he was a fully qualified Naval Aviator.
His first assignment was to Fleet Aircraft Service Squadron 7 at NAS San Diego (now known as NAS North Island). Two months later he was assigned to Fighter Squadron 51 (VF-51), an all-jet squadron, and made his first flight in a jet, an F9F-2B Panther, on January 5, 1951. In June, he made his first jet carrier landing on the USS Essex and was promoted the same week from Midshipman to Ensign. By the end of the month, the Essex had set sail with VF-51 aboard, bound for Korea, where they would act as ground-attack aircraft.
Armstrong first saw action in the Korean War on August 29, 1951, as an escort for a photo reconnaissance plane over Songjin. On September 3, 1951, Armstrong flew armed reconnaissance over the primary transportation and storage facilities south of the village of Majon-ni, west of Wonsan; while he was making a low bombing run at about 350 mph (560 km/h), Armstrong's F9F Panther was hit by anti-aircraft fire. While trying to regain control, Armstrong collided with a pole at a height of about 20 feet (6.1 m), which sliced off an estimated three feet of the Panther's right wing. Armstrong was able to fly the plane back to friendly territory, but due to the loss of the aileron, ejection was his only safe option. He planned to eject over water and await rescue by Navy helicopters, and therefore flew to an airfield near Pohang, but his ejection seat was blown back over land. A jeep driven by a room-mate from flight school picked Armstrong up; it is unknown what happened to the wreckage of No. 125122 F9F-2.
Armstrong flew 78 missions over Korea for a total of 121 hours in the air, most of which were in January 1952. He received the Air Medal for 20 combat missions, a Gold Star for the next 20, and the Korean Service Medal and Engagement Star. Armstrong left the Navy at the age of 22 on August 23, 1952, and became a Lieutenant, Junior Grade in the United States Naval Reserve. He resigned his commission in the Naval Reserve on October 21, 1960.
As a research pilot, Armstrong served as project pilot on the F-100 Super Sabre A and C variants, F-101 Voodoo, and the Lockheed F-104A Starfighter. He also flew the Bell X-1B, Bell X-5, North American X-15, F-105 Thunderchief, F-106 Delta Dart, B-47 Stratojet, KC-135 Stratotanker, and was one of eight elite pilots involved in the paraglider research vehicle program (Paresev).
Armstrong's first flight in a rocket plane was on August 15, 1957, in the Berll X-1B, to an altitude of 11.4 miles (18.3 km). The nose landing gear broke on landing, which had happened on about a dozen previous flights of the Bell X-1B due to the aircraft's design. He later flew the North American X-15; Armstrong would fly the aircraft seven times before September 1962, and during his penultimate X-15 flight, he reached an altitude of 207,500 feet (63.2 km).
Armstrong was involved in several incidents that went down in Edwards folklore and/or were chronicled in the memoirs of colleagues. The first was an X-15 flight on April 20, 1962, when Armstrong tested a self-adjusting control system. He flew to a height of 207,000 feet (63 km), (the highest he flew before Gemini 8), but he held the aircraft nose up too long during descent, and the X-15 bounced off the atmosphere back up to 140,000 ft (43 km). At that altitude, the atmosphere is so thin that aerodynamic surfaces have almost no effect. He flew past the landing field at Mach 3 (2,000 mph, or 3,200 km/h), over 100,000 feet (30 km) altitude, and ended up 40 miles (64 km) south of Edwards (legend has it that he flew as far as the Rose Bowl). After sufficient descent, he turned back toward the landing area, and barely managed to land without striking Joshua trees at the south end. It was the longest X-15 flight in both time and distance of the ground track.
Four days later, Armstrong was involved in a second incident, when he flew for the only time with Chuck Yeager. Their job, flying a T-33 Shooting Star, was to evaluate Smith Ranch Dry Lake for use as an emergency landing site for the X-15. In his autobiography, Yeager wrote that he knew the lake bed was unsuitable for landings after recent rains, but Armstrong insisted on flying out anyway. As they attempted a touch-and-go, the wheels became stuck and they had to wait for rescue. Armstrong tells a different version of events, where Yeager never tried to talk him out of it and they made a first successful landing on the east side of the lake. Then Yeager told him to try again, this time a bit slower. On the second landing, they became stuck and according to Armstrong, Yeager was in fits of laughter.
Many of the test pilots at Edwards praised Armstrong's engineering ability. Milt Thompson said he was "the most technically capable of the early X-15 pilots." Bill Dana said Armstrong "had a mind that absorbed things like a sponge." Those who flew for the Air Force tended to have a different opinion, especially people like Chuck Yeager and Pete Knight, who did not have engineering degrees. Knight said that pilot-engineers flew in a way that was "more mechanical than it is flying," and gave this as the reason why some pilot-engineers got into trouble: their flying skills did not come naturally.
NASA AND Apollo 11
A March 1969 meeting between Deak Slayton, George Low, Bob Gilruth and Chris Kraft determined that Armstrong would be the first person on the Moon, in some part because NASA management saw Armstrong as a person who did not have a large ego.
The objective of Apollo 11 was to land safely rather than to touch down with precision on a particular spot. Three minutes into the lunar descent burn, Armstrong noted that craters were passing about two seconds too early, which meant the Eagle would probably touch down beyond the planned landing zone by several miles.
When Armstrong noticed they were heading towards a landing area which he believed was unsafe, he took over manual control of the LM, and attempted to find an area which seemed safer, taking longer than expected, and longer than most simulations had taken. For this reason, there was concern from mission control that the LM was running low on fuel. Upon landing, Aldrin and Armstrong believed they had about 40 seconds worth of fuel left, including the 20 seconds worth of fuel which had to be saved in the event of an abort. During training, Armstrong had landed the LLTV with less than 15 seconds left on several occasions, and he was also confident the LM could survive a straight-down fall from 50 feet (15 m) if needed. Analysis after the mission showed that at touchdown there were 45 to 50 seconds of propellant burn time left.
The landing on the surface of the moon occurred at 20:17:39 UTC on July 20, 1969. When a sensor attached to the legs of the still hovering Lunar Module made lunar contact, a panel light inside the LM lit up and Aldrin called out, "Contact light." As the LM settled on the surface Aldrin then said, "Okay. Engine stop," and Armstrong said, "Shutdown." The first words Armstrong intentionally spoke to Mission Control and the world from the lunar surface were, "Houston, Tranquility Base here. The Eagle has landed." Aldrin and Armstrong celebrated with a brisk handshake and pat on the back before quickly returning to the checklist of tasks needed to ready the lunar module for liftoff from the Moon should an emergency unfold during the first moments on the lunar surface. During the critical landing, the only message from Houston was "30 seconds", meaning the amount of fuel left. When Armstrong had confirmed touch-down, Houston expressed their worries during the manual landing as "You got a bunch of guys about to turn blue. We're breathing again".
After Apollo 11
The press often asked Armstrong for his views on the future of spaceflight. In 2005, Armstrong said that a manned mission to Mars will be easier than the lunar challenge of the 1960s: "I suspect that even though the various questions are difficult and many, they are not as difficult and many as those we faced when we started the Apollo [space program] in 1961." In 2010, he made a rare public criticism of the decision to cancel the Ares 1 launch vehicle and the Constellation moon landing program. In an open public letter also signed by Apollo veterans Jim Lovell and Gene Cernan, he noted, "For The United States, the leading space faring nation for nearly half a century, to be without carriage to low Earth orbit and with no human exploration capability to go beyond Earth orbit for an indeterminate time into the future, destines our nation to become one of second or even third rate stature". Armstrong has also publicly recalled his initial concerns about the Apollo 11 mission, when he had believed there was only a 50% chance of landing on the moon. "I was elated, ecstatic and extremely surprised that we were successful", he later said.
On November 18, 2010, at age eighty, Armstrong said in a speech during the Science and Technology Summit in The Hague, Netherlands, that he would offer his services as commander on a mission to Mars if he were asked.