What does E4 stand for?

MLA style: "E4." Acronym Finder . 2012. AcronymFinder.com 11 Feb. 2012 http://www.acronymfinder.com/Echelon-4-(US-DoD)-(E4).html
Chicago style: Acronym Finder . S.v. "E4." Retrieved February 11 2012 from http://www.acronymfinder.com/Echelon-4-(US-DoD)-(E4).html
APA style: E4. (n.d.) Acronym Finder. (2012). Retrieved February 11 2012 from http://www.acronymfinder.com/Echelon-4-(US-DoD)-(E4).html

Echelon 4 (US DoD)

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