The biggest factor in how many calories you burn per mile of walking is your weight rather than your speed. According to the research that produced these numbers, at a walking pace speed makes only a minor difference. You will burn more calories by walking more miles.
I believe the Army starts their fiscal year on 1st October and runs until 30 September.
The fiscal year for all entities starts on 1 January and ends 31 December, consistent with the calendar year, to match the tax year, statutory year, and planning year.