What the City of Saskatoon does offer is an assessment appeal process open to any owner, veteran or not: if you believe your assessed value is wrong, you can appeal to the Board of Revision within 30 days of your assessment notice, and a successful appeal lowers the tax bill by lowering the assessment it is based on.
Any provincial support for veterans in Saskatchewan runs through other channels entirely, such as federal Veterans Affairs Canada benefits and disability programs, not through the municipal tax roll, so a veteran homeowner in Saskatoon pays the same mill rate as any neighbour on the same street.
If you are weighing whether to sell rather than keep paying that tax bill, Joel can tell you where your assessment sits against current value. Get your hand-reviewed valuation from Joel Dyck.