| Clue | Source | Date |
|---|---|---|
| Echoic phrase from a WWI marching song | LA Times Daily | 29 Dec 2018 |
| Echoic phrase from a WWI marching song | The Washington Post | 29 Dec 2018 |
| Echoic phrase from a WWI marching song | ||
| "Pack Up Your Troubles" suggestion | ||
| DON'T look so sad! | ||
| Advice in a 1915 song | ||
| Lyricist Asaf's advice in a 1915 song |