A continuing need exists for facilities to test both storable and cryogenic liquid-propellant rocket engines and stages at simulated altitude as part of a responsible acquisition risk reduction program. Storable propellant Intercontinental Ballistic Missile (ICBM) Post Boost Vehicles (PBV) require simulated altitude testing as part of the Aging and Surveillance programs designed to ensure an effective and reliable missile system. Likewise, simulated altitude testing is necessary acquisition risk reduction for advanced cryogenic rocket engines and stages that are being upgraded or developed to satisfy a variety of defense and commercial payload requirements.A review of the liquid rocket test facilities at Arnold Engineering Development Center (AEDC) is presented. The facility capabilities used in support of acquisition risk reduction are described, as are new facility capabilities recently completed or funded. Furthermore, a description of the technology applications available at AEDC in support of liquid rocket diagnostics, analysis, and evaluation techniques is presented.