Post edit history
DDM
| Before | After | ||
|---|---|---|---|
| 1 | 2500 was before the grid. 1800 was after the grid requirement. | 1 | 2500 was before the grid. 1800 was after the grid requirement. The 2500m DDM was a completely different unit concept. | 

| Before | After | ||
|---|---|---|---|
| 1 | 2500 was before the grid. 1800 was after the grid requirement. | 1 | 2500 was before the grid. 1800 was after the grid requirement. The 2500m DDM was a completely different unit concept. |