Engagement Control Station 
Expeditionary Combat Support 
Emergency Communications Staff 
Embedded Computer System 
Engine Control System 
Equipment Concentration Site 
Education Career Stabilization 
Electronic Contract Solicitation 
Encryption Control Signal 
Engine Control Systems 
Equipment Concentration Sites 
Exterior Communications System 
Electronic Combat Squadron 
Electronic Combat Support 
Electronic Communication Systems 
Electronic Control System 
Electronic Customer Services 
Emergency Calling Service 
Engagement Control Situation 
Engagement Control System 
Engineer Combat System 
Engineering Change Proposals 
engineering change support 
Enhanced Collection System 
Evolution Control System 
Exercise Control System