-1
If you barely have the time to come up with something to make your promotions even the slightest bit different from what has become the norm, I suggest that you find someone else to do them for you.
Promotions should be a special thing for all troopers. A sense of pride and accomplishment becomes sort of jaded when all I hear is "Go up one, Go up to..., Go up one to..., Go to..."
Need some ideas?
Private Username, you've done an excellent job today befitting of a [Battalion] trooper. You've proven yourself worthy of the rank of [Rank] within the battalion. Congratulations.