What does FOU stand for?

Field Operating Unit (VLIE)

Forward Oberservation Unit (SAUO)

Forward Observation Unit (SAUS)

Forward Observer Unit (SAUO)

Fougamou - Gabon - Airport symbol (OAG)

Fourteen - Telegraphy (PCTE)

Grumman Boats, Arkadelphia, AR - Manufacturer code for watercraft hull identification number (USCG)