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ETD (1) Estimated Time of Departure. (2) Electronic Transfer Device.
MDA GLOSSARY, VER. 4.0 E
98
ETERTS End-to-End Real Time Simulator.
ETESD End-to-End Sensor Demonstration.
ETI Estimated Time of Intercept.
ETIC Estimated Time for Completion.
ETM Engineering Test Model
ETR (1) Extended Test Range (Pacific Test Bed) (2) See Eastern Test Range. (3)
Environmental Test Round. (4) Estimated Time to Repair.
ETS (1) Experimental Test System. (2) Experimental Test Site.
EU European Union [formerly European Community (ECI)]
EUCOM European Command. See USEUCOM.
EURATOM European Atomic Energy Agency.
EUREKA European Research and Coordinating Agency.
EUT Early User Test.
EV Experimental Version
EVA Extravehicular Activity.
Evasive MRV A reentry vehicle, which maneuvers for the purpose of evading defensive
weapons.
Event Based
Contracting
Support “event driven acquisition strategy” by linking specific contractual events
to the “exit criteria” for the acquisition phase, or to intermediate development
events established for the acquisition strategy.
Event Driven
Acquisition
Strategy
An acquisition strategy that links program decisions to demonstrated
accomplishments in development, testing, and production.
Event Validation A sensor element internal process that results in a determination by the operator
that the sensor is healthy and the event reported is real.
Event
Verification
The process by which it is decided, from SDS external data, that the event
reported is real.
MDA GLOSSARY, VER. 4.0 E
99
Evolutionary
Acquisition
(1) An approach in which a core capability is fielded, and the system design has
a modular structure and provisions for future upgrades and changes as
requirements are refined. An evolutionary acquisition strategy is well suited to
high technology and software intensive programs where requirements beyond a
core capability can be generally, but not specifically, be defined.
(2) An acquisition strategy that defines, develops, produces or acquires, and
fields an initial hardware or software increment (or block) of operational capability.
It is based on technologies demonstrated in relevant environments, time-phased
requirements, and demonstrated manufacturing or software deployment
capabilities. These capabilities can be provided in a shorter period of time,
followed by subsequent increments of capability over time that accommodate
improved technology and allowing for full and adaptable systems over time. Each
increment will meet a militarily useful capability specified by the user (i.e., at least
the thresholds set by the user for that increment); however, the first increment
may represent only 60% to 80% of the desired final capability. (MDA Lexicon)
Evolutionary
Requirements
Definition
Mission needs are first expressed in broad operational capability terms, and then
progressively evolved to system specific performance requirements.
EVPA Experimental Version Performance Assessment.
EVPA/TEVS Experimental Version Performance Assessment Test Environment System.
EVS Enhanced Verdin System.
EW (1) Electronic Warfare. (2) Early Warning.
EW/AA Early Warning and Attack Assessment.
EWCC Expanded Weapons Control Computer (PATRIOT).
EWDA Energy and Water Development Appropriations (US).
EWG Event Working Group.
EWN Early Warning Net.
EWO Electronic Warfare Officer.
EWPE Electronic Warfare Pre-Processing Element.
EWR Early Warning Radar.
EWS Early Warning System.
EXCEDE Electron Accelerator Experiment.
Excimer A contraction for “excited dimer”; a type of lasant. A dimer is a molecule
consisting of two atoms. Some dimers (e.g., xenon chloride and krypton fluoride)
are molecules, which cannot exist under ordinary conditions of approximate
thermal equilibrium but must be created in an “excited” (e.g., energized) condition
by special “pumping” processes in a laser.
Excimer Laser
(EXL)
A laser in which emission is stimulated when a gas is shocked with electrical
energy and the excited medium emits light when returning to a ground state.
MDA GLOSSARY, VER. 4.0 E
100
EXCOM Executive Committee.
Executable
Program
A program is executable if the PM has adequate near-term approved funding.
Executing Agent The individual within the executing element assigned responsibility for managing
MDA funded programs.
Executing
Elements
Agencies or organizations (DoD or non-DoD) that are managing BMD-related
programs.
Executing
Responsibility
　
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