Acronyms
APU
auxiliary power unit
ASRM
advanced solid rocket motor
CLCS
checkout launch and control system
COTS
commercial off-the-shelf
DSS
Decision Support System
DoD
U.S. Department of Defense
FES
flash evaporator system
FY
fiscal year
HEDS
Human Exploration and Development of Space
IUS
inertial upper stage
ISS
International Space Station
JSC
Johnson Space Center
KSC
Kennedy Space Center
LFBB
liquid fly-back booster
MSFC
Marshall Space Flight Center
NASA
National Aeronautics and Space Administration
NPD
NASA Policy Directive
NRC
National Research Council
NSPD
National Space Policy Directive
OMS
orbital maneuvering system
PAM
payload assist module
PEM
proton exchange membrane
QRAS
quantitative risk assessment system
R&D
research and development
RCS
reaction control system
RLV
reusable launch vehicle
RSRB
reusable solid rocket booster
S&PU
safety and performance upgrades
SFOC
space flight operations contract
SSME
space shuttle main engine
SSUPRCB
Space Shuttle Upgrades Program Requirements Control Board
USA
United Space Alliance corporation
USNRC
U.S. Nuclear Regulatory Commission
WME
water membrane evaporator