What does MACU stand for?

Maintenance Assembly Change Unit (SAUS)

Mangrove Cuckoo - Common English name - Scientific name: Coccyzus Minor - American Ornithologists Union four-character bird identification (IBP)

Marine Auto and Cargo Services International - Intermodal shipping container symbol (TVRC)

Material Cost per Unit (ACAE)

Monitor and Control Unit - Aerospace (IAA)