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-end depends on the company. While most companies have a fiscal year-end at the end of December, others vary based on the industry or some other business need. Many companies operate on a non-calendar business cycle or have a supplier base that does.