Echoic phrase from a WWI marching song Crossword Clue

Today's (29 December 2018) crossword provided to us by L.A. Times Daily and the clue is "Echoic phrase from a WWI marching song".
The right answer or rather the best answer listed below:

Understanding Today's Crossword Puzzle

Today's crossword clue, "Echoic phrase from a WWI marching song," leads to the answer "SMILESMILESMILE." This answer is derived from the famous World War I marching song lyrics which repetitively emphasize the word "SMILE." The marching songs of that era often contained catchy, repetitive phrases to boost morale and keep spirits high among soldiers. In this case, "SMILESMILESMILE" reflects the upbeat and positive nature of the song, aimed at fostering a sense of optimism and unity during challenging times of war.

 The Crossword clue "Echoic phrase from a WWI marching song" published 1 time/s & has 1 answer/s. 

Crossword	Date	Answer
L.A. Times Daily	29 December 2018	SMILESMILESMILE