I think these links may go some way towards explaining the concept behind the name.

http://rasc.larc.nasa.gov/rasc_new/execsummary02/Presentations/OASIS_02/Presentations/oasis_512.avi

http://spacecraft.ssl.umd.edu/old_site/academics/484S03/oasis_docs/OASIS_FY01_FINAL.PDF

(Large Files)

http://spacecraft.ssl.umd.edu/old_site/design_lib/OASISEXEC_97.pdf - An earlier report

These reports show the Shuttle being used to deliver components to LEO. As it will probably be de-commissioned by the time Project Constellation is underway, the CEV will be the new element in the system. My money is on a lifting body design like the HL-20 / HL-42.

http://www.astronautix.com/craft/hl20.htm

As it is eventually planned to exploit lunar resources such as Oxygen (extracted from the Lunar Regolith) this will need to be factored into the system; perhaps at a later stage. The Lunox project (1993) would fit in quite nicely to the overall project.

http://www.abo.fi/~mlindroo/Station/Slides/sld051p.htm

Discuss

Sorry about the links - Must Learn.