Similar to 4SR-21

ACCMP - Asphalt Coated Corrugated Metal Pipe
ACE - Air Circulating Embankment
ACES - Advanced Concept Ejection Seat
ACF - Activated Carbon Filter
ACFC - Air Cooled Flooded Chiller
ACFH - Animal Chatter Farm - Horse
ACFMS - Airframe Cumulative Fatigue Monitoring System

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