| Regimental number | 3402 |
| Place of birth | Karlslong, Sweden |
| Age on arrival in Australia | 17 |
| Religion | Lutheran |
| Occupation | Labourer |
| Address | Carlton, Victoria |
| Marital status | Married |
| Age at embarkation | 23 |
| Next of kin | Wife, Mrs Lou Hallberg, 252 Swanston Street, Melbourne, Victoria |
| Enlistment date | |
| Rank on enlistment | Private |
| Unit name | 57th Battalion, 9th Reinforcement |
| AWM Embarkation Roll number | 23/74/4 |
| Embarkation details | Unit embarked from Melbourne, Victoria, on board HMAT A29 Suevic on |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 57th Battalion |
| Other details from Roll of Honour Circular | He enlisted on 15th March, 1917 - 57th Bn 9th Reinforcements; Taken on Strength 57th Bn on 7th January,1918. |
| Fate | Killed in Action |
| Miscellaneous details (Nominal Roll) | *Given name Yohan Helmer |
| Place of death or wounding | Belgium |
| Age at death | 24 |
| Age at death from cemetery records | 24 |
| Place of burial | La Plus Douve Farm Cemetery (Plot III, Row B, Grave No. 6), Belgium |
| Panel number, Roll of Honour, Australian War Memorial | 163 |
| Miscellaneous information from cemetery records | Parents: Otto and Selina HALLBERG; husband of Lou HALLBERG, 195 Drummond Street, Carlton, Victoria. Native of Karsbsborg, Sweden |
| Other details |
War service: Western Front Medals: British War Medal, Victory Medal |