Gengis
kg*inches?? BAD MOVE!
Any organization that mixes its systems like that ought to be drowned slowly in its own excrement. That's right in there with the EPA with the grams per mile emission requirements.
The United States passed a metric conversion act sometime around 1900 but it didn't get off the ground.
The nice thing about the SI subset of the metric system is that most constants drop out except for the horribly inconvenient electrical and magnetic characteristics of free space.
Canberra
Yeahbut...
The mil is a natural unit of measurement (milliradian) and is real handy for directing gunfire as for small angles the angle is equal to its own sine if radian measure is used. Thus at a range of 1000 whatevers, traversing the gun 10 mils moves the point of impact 10 whatevers. The radian and its subdivisions, being dimensionless, leap back and forth among systems of measurement gleafully removing the dreaded 2*pi from many equations involving rotation.