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Apollo 1 (official designation Apollo/Saturn-204) was planned to be the first manned mission of the Apollo manned lunar landing program, set to launch in February 1967. Its flight was precluded by a fatal fire on January 27, which killed all three crew members (Command Pilot Virgil "Gus" Grissom, Senior Pilot Edward H. White, and Pilot Roger B. Chaffee), and destroyed the Command Module cabin.This occurred during a pre-launch test of the spacecraft on Launch Pad 34 at Cape Canaveral. The name Apollo 1, chosen by the crew, was officially assigned retroactively in commemoration of them.

The Apollo 204 Accident Review Board was promptly formed to determine the cause of the tragedy. Although the ignition source of the fire was never conclusively identified, the astronauts' deaths wereattributed to a wide range of lethal design and construction flaws in the early Apollo Command Module. The manned phase of the project was delayed for twenty months while these problems were fixed. The Saturn IB launch vehicle SA-204 (Saturn/Apollo) intended to fly the mission was later used for the first unmanned Lunar Module test flight, Apollo 5.

Apollo 2
AS-203 (or SA-203, sometimesinformally called Apollo 2) was an unmanned flight of the Saturn IB rocket on July 5, 1966. It carried no Apollo Command/Service Module spacecraft, as its purpose was to verify the design of the S-IVB rocket stage restart capability that would later be used in the Apollo program to boost astronauts from Earth orbit to a trajectory towards the Moon. It successfully achieved its objectives, but the stage wasinadvertently destroyed after four orbits.
APOLLO3

AS-202 (or SA-202, sometimes informally called Apollo 3), flown August 25, 1966, was the second unmanned, suborbital test flight of a production Block I Apollo Command/Service Module launched with the Saturn IB launch vehicle. It was the first flight which included the spacecraft Guidance and Navigation Control system and fuel cells. Thesuccess of this flight enabled the Apollo program office to judge the Block I spacecraft and Saturn IB ready to carry men into orbit.
Apollo 4
also known as Apollo-Saturn 501 (AS-501), was an A type mission - the first flight of the Saturn V launch vehicle, carrying no crew. It was also the first flight of the S-IC and S-II stages of the rocket. The launch, at 7:00 a.m. EST on November 9, 1967 fromLaunch Complex 39, was the first from the John F. Kennedy Space Center on Merritt Island. The mission tested the complete Saturn V and Apollo Command/Service Module (CSM) stack in what is known in the aerospace industry as an "all-up test", meaning all stages were live and functional. The mission tested the newly revised Block II Apollo Command Module and tested its heat shield at simulatedlunar-return speeds of approximately 25,000 mph (40,000 km/h). The mission was deemed by NASA as a complete success. It helped advance the Apollo program in its goal of landing men on the Moon by the end of the 1960s.
Apollo 5
mission tested the Lunar Module in a space environment, in particular its descent and ascent engine systems, and its ability to separate the ascent and descent stages. Thedescent engine would become the first throttleable rocket engine fired in space.

The mission also performed a "fire in the hole" test (as depicted in the mission's insignia) in which the ascent stage engine would be fired while still attached to the descent stage. This was intended to simulate a landing abort during descent to the lunar surface.

Apollo 6
launched on April 4, 1968, was an Atype mission - Apollo program's second and last unmanned test flight of its Saturn V launch vehicle. While the vehicle experienced a number of significant malfunctions, the flight nonetheless provided NASA with enough confidence in the Saturn V to proceed to manned launches.
Apollo 7
(October 11-22, 1968) was the first manned mission of Project Apollo, and the first manned US space mission...