(in World War II) European Theater of Operations.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for eto
Liebling was the least pretentious-looking correspondent in the ETO.The Story of the American Journalists Who Landed on D-Day|Timothy M. Gay|June 6, 2012|DAILY BEAST
Immediately wrest of Daliao are three villages whose people are known as Eto or Ata.The Wild Tribes of Davao District, Mindanao|Fay-Cooper Cole