YVVI means Directorate of Launch Base Operations, Inertial Upper Stage Division in
NASA
Similar to YVVI
A/D - Analog-to-Digital
A/E - Architectural and Engineering
A/E - Activity Elements
A/F - Air-to-Fuel Ratio
A/FM - Air/Firing Mechanism
A/G - Air to Ground
A/L - AutoLand
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