[DOC] [TLE] NASA Moves One Step Closer To Shuttle Successor - Rense [PAR] The Space Launch Initiative (SLI), a NASA-wide effort defining the future of 
human space ... for the nation's second-generation reusable space transportation 
system. ... to aid in the development of a second-generation reusable launch 
vehicle. [DOC] [TLE] NASA - Space Launch Initiative fact sheet (04/02) [PAR] The initiative is driven by one inescapable fact recognized by NASA, industry, the 
... The Shuttle - the nation's first generation reusable system - was developed in 
the ... NASA the lead role for developing reusable launch vehicle technologies. ... 
launch vehicles remains the key goal of NASA's space transportation efforts. [DOC] [TLE] Challenges Facing NASA's Space Launch Initiative - Government ... [PAR] undertaking a new effortthe Space Launch Initiative (SLI)to develop a ... 
transportation technologies and transportation systems, including space vehicles 
that ... generation of reusable space transportation vehicles. (See fig. 1 and table. 
1.)... [DOC] [TLE] Space Launch Vehicles: Government Activities, Commercial ... [PAR] Apr 17, 2003 ... NASA's Efforts to Develop New Reusable Launch Vehicles (RLVs). X-33 and X-
34 ... On February 1, 2003, NASA's space shuttle Columbia broke apart during its 
descent ... Congress cut $40 million from the Space Launch Initiative in FY2003. 
..... for a next-generation reusable space transportation system. [DOC] [TLE] Commercial Crew Development - Wikipedia [PAR] Commercial Crew Development (CCDev) is a multiphase, space technology 
development ... The NASA CCDev program followed Commercial Orbital 
Transportation ... ultimately be used in commercial crew human space 
transportation systems. .... it would likely wind down its efforts to develop a 
commercial crew vehicle. [DOC] [TLE] Reusable Booster System - Wikipedia [PAR] The Reusable Booster System (RBS) was a United States Air Force research 
program, circa 2010 to 2012, to develop a new prototype vertical-takeoff, 
horizontal-landing (VTHL) reusable booster and a new prototype expendable 
second stage to replace the existing Evolved Expendable Launch Vehicles (
EELV) after 2025 ... A large-liquid-engine group comprising the Air Force Space 
Command,... [DOC] [TLE] Boeing X-37 - Wikipedia [PAR] The Boeing X-37, also known as the Orbital Test Vehicle (OTV), is a reusable 
unmanned spacecraft. It is boosted into space by a launch vehicle, then re-enters 
Earth's .... Boeing had said the space planes would use OPF-1 in January 2014, 
and the Air ... The Air Force states that this includes testing avionics, flight 
systems,... [DOC] [TLE] SLI Takes A Small Step Forward Into An Uncertain Future - SpaceRef [PAR] May 1, 2002 ... Dennis Smith, NASA Space Launch Initiative Program Manager, Marshall ... 
Reusable Space Transportation Systems, Lockheed Martin Space Systems ... to 
Smith, is "to develop far more reliable, more affordable access to space. ... While 
these goals are rather straightforward, one aspect of SLI is not: the... [DOC] [TLE] Quality initiatives in the commercial development of reusable launch ... [PAR] evidenced by its past X-programs and space launch initiatives. ... systems, 
coupled with the downturn of the Low Earth Orbit market, have made ... this thesis 
provides a historical perspective of both RLV development efforts within the .... 1. 
Government RLV Development: Early Testing of Reusable. Launch Technology . [DOC] [TLE] The Future of Space Transportation - National Space Society [PAR] Everybody agrees that space launch is broken, ... Major changes and initiatives 
are underway that ... rockets, and a major effort at defining a fully reusable ... 
Today's space shuttle systemthe orbiter, external ... operations, and how long 
until a successor reusable ... suggested that if the development of the new gener-
. [DOC] [TLE] Boeing Rocketdyne Chooses Design for Next-Generation Reusable ... [PAR] Jan 28, 2002 ... based Rocketdyne are developing the RS-83 engine for NASA's SLI program for 
future reusable space transportation. ... efforts, the RS-68 for the Boeing Delta IV 
expendable launch system, and ... successors of the generation of engineers that 
developed the F-1 and J-2 engines for Apollo and the SSME

Question: The Space Launch Initiative is an effort to develop a reusable transport system as a successor to this one
Answer: the space shuttle