Overcome By Events 
overtaken by events 
Operating Basis Event 
Order of the British Empire 
out-of-body experience 
On-Board Equivalent 
Operating-basis earthquake 
Optical Bench Enclosure 
Out-of-Band Emission 
IATA code for Okeechobee County Airpor… 
Observation Executive 
ON-BOARD EQUIPMENT 
Operating Basis Earthquake 
optical Bloch equation 
Orange Board of Education 
Ordinary Bloody Effort 
Officer of the British Empire 
Officer, Order of the British Empire