53 RSO definitions

Range Safety Officer 
Radiation Safety Officer 
Retirement Services Office 
Radiation Safety Office 
Resident Space Object 
Resident Surgical Officer 
Retirement Services Officers 
ROSCO 
Radiological Safety Office 
railway sub-office 
regional security officer 
Regional Standards Organization 
right superior oblique 
Aero Asia International 
Radar Set-On 
Radiation Safety Offcer 
Radiation Safety Officier 
Radiological Safety Officer 
Radiosynoviorthesis 
railway sorting office 
Range Safety Office 
rapeseed oil 
Rapid Scan Operations 
Rapid Science Orbit 
reactor system outline 
Receiver, Set-on 
Reconnaissance & Survey Officer 
Reconnaissance and Surveillance Operat… 
reconnaissance and survey officer 
Reconnaissance Systems Officer