What does DUG stand for?

Datapac User Group (SAUO)

Douglas - Arizona - Airport symbol (OAG)

Dugas Aluminum Boat Works, Saint Martinville, LA - Manufacturer code for watercraft hull identification number (USCG)

Dugway - Utah - Seismograph station code, US Geological Survey (SEIS)

Duruma - Language code (ETLW)