GEO

geosynchronous Earth orbit

GG

gas generator

GSE

ground support equipment

GTO

geosynchronous transfer orbit

HC

hydrocarbon

HCB

hydrocarbon boost

HEO

high Earth orbit

IHPRPT

Integrated High Performance Rocket Propulsion Technology

IOC

initial operating capability

IOC

initial operational capability

IPA

independent program assessment

IPD

Integrated Powerhead Demonstration

Isp

specific impulse

ISS

International Space Station

IVHM

integrated vehicle health management

LCH4

liquid methane

LCC

life cycle cost

LEO

low Earth orbit

LES

large expendable stage

LH2

liquid hydrogen

LO2

liquid oxygen

MCC

main combustion chamber

MEO

medium Earth orbit

MLP

mobile launch platform

MPS

main propulsion system

MR

mixture ratio

MSFC

Marshall Space Flight Center (NASA)

MST

mobile service tower

NAFCOM

NASA/Air Force Cost Model

NASA

National Aeronautics and Space Administration

NASP

National AeroSpace Plane

NPOESS

National Polar-Orbiting Operational Environmental Satellite System

NRC

National Research Council

ORSC

oxygen rich, staged combustion

PWR

Pratt and Whitney Rocketdyne

R&D

research and development

RBD

reusable booster demonstrator

RBS

reusable booster system

RECO

rocket engine cut-off

RLC

recurring launch cost

RLV

reusable launch vehicle

RP

rocket propellant



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