The Apollo Applications Program (AAP) was created as early as 1966 by NASA headquarters to develop science-based human spaceflight missions using hardware developed for the Apollo program. AAP was the ultimate development of a number of official and unofficial Apollo follow-on projects studied at various NASA labs. However, the AAP's ambitious initial plans became an early casualty when the Johnson Administration declined to support it adequately, partly in order to implement its Great Society set of domestic programs while remaining within a $100 billion budget. Thus, Fiscal Year 1967 ultimately allocated $80 million to the AAP, compared to NASA's preliminary estimates of $450 million necessary to fund a full-scale AAP program for that year, with over $1 billion being required for FY 1968. The AAP eventually led to Skylab, which absorbed much of what had been developed under Apollo Applications.
NASA management was concerned about losing the 400,000 workers involved in Apollo after landing on the Moon in 1969. A reason Wernher von Braun, head of NASA's Marshall Space Flight Center during the 1960s, advocated for a smaller station after his large one was not built was that he wished to provide his employees with work beyond developing the Saturn rockets, which would be completed relatively early during Project Apollo. NASA set up the Apollo Logistic Support System Office, originally intended to study various ways to modify the Apollo hardware for scientific missions. Initially the AAP office was an offshoot of the Apollo "X" bureau, also known as the Apollo Extension Series. AES was developing technology concepts for mission proposals based on the Saturn IB and Saturn V boosters. These included a crewed lunar base, an Earth-orbiting space station, the so-called Grand Tour of the Outer Solar System, and the original Voyager program of Mars Lander probes.
The Apollo lunar base proposal saw an uncrewed Saturn V used to land a shelter based on the Apollo Command/Service Module (CSM) on the Moon. A second Saturn V would carry a three-person crew and a modified CSM and Apollo Lunar Module (LM) to the Moon. The two-person excursion team would have a surface stay time of nearly 200 days and use of an advanced lunar rover and a lunar flier as well as logistics vehicles to construct a larger shelter. The isolation of the CSM pilot was a concern for mission planners, so proposals that it would be a three-person landing team or that the CSM would rendezvous with an orbiting module were considered.
The following phases were considered:
The Apollo LM Taxi was essentially the basic Apollo LM modified for extended lunar surface stays. This was expected to be the workhorse of both Apollo Applications Extended Lunar Surface Missions beginning in 1970 and to larger Lunar Exploration System for Apollo in the mid-to-late 1970s.
The Apollo LM Shelter was essentially an Apollo LM with ascent stage engine and fuel tanks removed and replaced with consumables and scientific equipment for 14 days' extended lunar exploration.
The MOBEV F2B was a multi-person surface-to-surface flying vehicle.
The basic Apollo hardware would evolve into AES (Apollo Extension Systems), followed by ALSS (Apollo Logistics Support System), and then LESA (Lunar Exploration System for Apollo). The result would be ever-expanding permanent stations on the Moon.
LESA (Lunar Exploration System for Apollo) represented the last lunar base concept studied by NASA prior to the cancellation of further Saturn V production. LESA would use a new Lunar Landing Vehicle to land payloads on the lunar surface and extended CSM and LM Taxi hardware derived from the basic Apollo program would allow crews to be rotated to the ever-expanding, and eventually permanent, lunar base. A nuclear reactor would provide power.
To support longer stays on the Moon, NASA also studied a number of simple Lunar Escape Systems as a means of returning two astronauts from the lunar surface to an orbiting CSM if the Lunar Module ascent-stage engine failed to ignite.
Another plan for Apollo-based extended-duration crewed spaceflight would use a Saturn V to send three crew on a Manned Venus Flyby, using the Saturn S-IVB stage as a "wet workshop". First the S-IVB would boost itself and the Apollo CSM on a trajectory that would pass by Venus and return to Earth, then any remaining fuel would be vented to space, after which the astronauts would live in the empty fuel tanks until they separated from the S-IVB shortly before reentry on their return to Earth.
When procurement of Saturn Vs other than those required for the lunar landing was stopped in 1968, focus shifted to AAP. Aside from attempting to show that Apollo presented value for money, NASA and the main contractors of Boeing, Grumman, North American Aviation and Rockwell also hoped to put off the inevitable scaling down of staff and facilities following the completion of the first Moon landing.
Three AAP proposals were selected for development:
In the meantime several of the Earth-orbit "checkout" missions for Apollo had been canceled, leaving a number of Saturn IBs unused. The plans were changed to use the S-IVB stage, used on both rockets, as the primary station structure. A modified S-IVB would be launched into orbit, the second stage carrying a docking module and large solar panels in the area normally carrying the LM. A CSM would then be able to dock with the second stage and enter the now-empty fuel tanks. It was also suggested that the Apollo Telescope and Survey Mission modules might be docked to the Wet Workshop to create a modular space station.
The "Planetary Grand Tour" was moved to the Mariner program as "Mariner Jupiter-Saturn", which was later calved off into the Voyager program. Two probes were launched in 1977 on Titan IIIE rockets, with Voyager 2 completing the full Grand Tour in 1989.
Originally, AAP missions would alternate with Apollo lunar missions, starting in 1969. However, when NASA's 1969 budget was cut, focus was shifted to the Skylab space station proposal, which managed to accommodate the equipment already specified for some of the AAP missions. Specifically, Skylab included the Apollo Telescope Mission (renamed the Apollo Telescope Mount) attached to the docking station used by the CSMs. Since the first two stages of the Saturn V had enough payload capability by themselves to place a pre-fabricated S-IVB workshop into the appropriate orbit, this enabled the "dry workshop" concept. This allowed the interior space to be better fitted out, although many design concepts from the "wet" workshop, notably the open flooring that allowed fuel to flow through it, were kept in Skylab.
The concept of launching another Skylab into lunar orbit using a spare S-IVB was briefly discussed around the same time, but no justification could be found for it, so the project was abandoned early on.
The Apollo-Soyuz Test Project involved a docking in Earth orbit between a CSM and a Soviet Soyuz spacecraft. The mission lasted from July 15 to July 24, 1975. Although the Soviet Union continued to operate the Soyuz and Salyut space vehicles, NASA's next crewed mission would not be until STS-1 on April 12, 1981.
|U.S. Mission||Booster||Crew||Launched||Mission goal||Mission result|
|Skylab 1||Saturn V||Uncrewed||May 14, 1973||Earth orbit||Partial success - launch of Skylab, first US space station; micrometeoroid shield and one solar panel lost at launch, second jammed during deployment|
|Skylab 2||Saturn 1B||Charles "Pete" Conrad, Paul Weitz, Joseph Kerwin||May 25, 1973||Space station mission||Success - Apollo spacecraft takes first US crew to Skylab for a 28-day stay; freed stuck solar panel and deployed replacement sunshield|
|Skylab 3||Saturn 1B||Alan Bean, Jack Lousma, Owen Garriott||July 28, 1973||Space station mission||Success - Apollo spacecraft takes second US crew to Skylab for a 59-day stay|
|Skylab 4||Saturn 1B||Gerald Carr, William Pogue, Edward Gibson||November 16, 1973||Space station mission||Success - Apollo spacecraft takes third US crew to Skylab for an 84-day stay|
|Apollo-Soyuz Test Project (ASTP)||Saturn 1B||Thomas P. Stafford, Vance D. Brand, Donald K. "Deke" Slayton||July 15, 1975||Earth orbit||Success - Apollo spacecraft conducted rendezvous and docking exercises with Soviet Soyuz 19 in Earth orbit. Upon landing, the Apollo Spacecraft was filled with toxic gas but the crew survived.|