Acronyms

John,

OSP is suppose to be the replacement to the
shuttle. Current vision is that it will on an
expendable launch vehicle (ELV) and then be used as a
crew rescue vehicle for the ISS and also be used for
repairing satellites in space and conducting
experiments and other LEO operations.

For more detailed information, I recommend you
search on the web or goto NASA's website for more.
One very good website is: http://www.ospnews.com/

Ryan