YVVI means Directorate of Launch Base Operations, Inertial Upper Stage Division in NASA
Similar to YVVI
ACCS - Advanced Checkout and Control SystemACE - Advanced Composition Explorer
ACE - Apollo Checkout Equipment
ACES - Acoustic Containerless Experiment System
ACF - Auto- Correlation Function
ACFS - Advanced Concepts Flight Simulator
ACFY - After the Current Fiscal Year
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