Economic Research Service 
Ethernet Relay Service 
European Remote Sensing 
expanding ring search 
Earth Resources Satellite 
Earth Recovery Subsystem 
Environmental Research Satellite 
Earth Remote Sensing 
Emergency Relocation Site 
Engineering Release System 
Entry and Recovery Simulation 
European Remote-Sensing Satellite 
Executive Resources Staff 
Elastic Recoil Spectrometry 
Electrically Reconfigurable Ship 
Emergency Response System 
Employee Retirement System 
Employees' Retirement System 
Erase 
Error Resolution System 
European Remote Sensing satellite 
European Respiratory Society 
Exclusive Right to Sell 
Existential Refusal Set 
Early repolarization syndrome 
Earnings-Related Supplement 
Earth Regeneration Society 
Earth Research Satellite 
Earth Resources Satellites 
Earth Resources Survey