There are so many factors here. If you’re near a military installation or your priest is affiliated with the community he may have been working at an ecumenical service. He could have taken that time on Veteran’s Day to go to the local VA to help the priest on duty give absolution to other veterans…or may be a regular volunteer there and felt that was where God was calling him to be. Is it possible your priest himself is a veteran?
I work with veterans on a daily basis and I can’t tell you what AMAZING support we get from faith communities in general. I couldn’t do my job without the fantastic and extraordinary acts of “everyday people” and even more so of the clergy. I am grateful every single day for the selfless donations of time, money, and gifts that make it possible for me, and others like myself, to do our jobs.
I wouldn’t assume just because you didn’t have Mass on Veteran’s Day this year that it was a slight towards your parish. Most likely, that time was being spent in another way of honoring our brave men and women who have served this country.