Dummy is a simulcrum, a weighted box of the correct dimensions.

Training is a box with some features of the real weapon. Interface at least, possibly including flight systems.

This would be my usage of the terms... not sure if this exactly matches the one used in this case.



e.g. a dummy cartridge is an inert round, a blank is a training round - in the case of a conventional small arms cartridge this would be a wad and a small amount of powder. Other types of training round might include plastic or 'airsoft' type non-lethal ammunition natures for force on force training where increased realism is desired with low risk technologies (Miles etc is expensive and complex compared to this).