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.
A fiscal year usually refers to an accounting year that does not end on December 31. One reason a business or other organization will have its accounting year end on a date other than December 31 is to fit its natural business year. For example, school districts will use fiscal years of July 1 through June 30.