What does OPF stand for?

Miami, FL - Location identifier - FAA (FAAL)

Object Persistence Framework

Official Personnel File (MCD)

Official Personnel Folder - Military

One-Piece Folder - Publishing (WDMC)

Open-Pore Foam - Plastic

Operations Flight - Military

Optical Propagation Facility

Orbiter Processing Facility - NASA (NASA)

Osmium Potassium Ferrocyanide (SAUS)

Output Filter (SAUS)

Overseas Project Fund - British Overseas Trade Board (DS)