ECHELON
British Encyclopedia · 1933 · p. 45
(esh’e-lon), a formation of succe ive and parallel units facing in the same direction, each on a flank and to the rear of the unit in front of it.
Bu kavram başka kaynaklarda da geçiyor
French-English Dictionary of Military Terms (1918)
Everybody's Encyelopedia (1912)
Chamber's Twientieth Century Dictionary (1908)
Chandler's Encyclopedia (1898)
Webster's Practical Dictionary- A Practical Dictionary of the Englih Language (1884)
A Military Dictionary and Gazetteer (1881)
Zell's Condensed Dictionary (1879)
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