That's a good question. It's probably just a matter of choice. The Department of National Defence may not see fit to include provincial taxes in the calculation, but we think it's relevant because it's a cost that the department will have to absorb.
As for federal sales taxes, they represent a zero cost, of course, because what DND would pay GST, for example, would be entirely returned to the government. But provincial taxes don't come back to the federal government. So that's a cost that we chose to include so that there would be more transparency. I honestly believe that DND should also include taxes for the same reason.