Emergency Medical Service
Emergency Services
Engineering Modeling Software
Enquiry Management System
Equipment Maintenance Squadron
Event Monitoring Service
Earth-Moon System
Electrician's Mates
Electronic Mail Service Provider
Electronic Maintenance Shop
Electronic Mapping System
Electronic Messaging Service Provider
Electronic Modules
Electronics Messaging Service
Emergency Alert Systems
Engineering and Maintenance Services
Equipment Management System
Essentials of Modeling and Simulation
Event Monitoring Services
Extended Memory System