| 285th Field Artillery Observation Battalion | |
|---|---|
| Active | 1942–1945 |
| Country |  United States |
| Branch |  United States Army |
| Role | Artillery sound ranging |
| Engagements | |
The 285th Field Artillery Observation Battalion was a United States Army unit that saw action in the Battle of the Bulge in World War II. Their main mission was to identify the location of enemy artillery using the "sound and flash" technique (sound ranging and flash spotting).[1]