If I fly in the national guard, how do I enter those days I was on military duty?

Flying in the military creates a different tax situation than those who fly civilian, even though they are both professional pilot jobs.  Civilian pilot jobs that fall under DOT hours of service limits are allowed to write off 80% of their M&IE expenses.  Military flying does not fall under DOT hours of service limits, and therefore only gets 50% of its M&IE expenses deducted.

For this reason, if a pilot flies both civilian and for the national guard, they should separate the entries into two different 2106 forms.