RTLS

return to launch site

S&T

science and technology

SES

small expendable stage

SLS

Space Launch System

SMC

Space and Missile Systems Center

SRB

solid rocket booster

SSME

space shuttle main engine

SSO

Sun-synchronous orbit

SSTO

single stage to orbit

TPA

turbopump assembly

TPS

thermal protection system

TRL

technology readiness level

TSTO

two stages to orbit

TVC

thrust vector control

VAFB

Vandenberg Air Force Base

VIF

vertical integration facility

VTHL

vertical takeoff, horizontal landing

WDR

wet dress rehearsal



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