I Recieved A Jury Summons in the Mail Today?

I Got this letter that i am summoned to apply for a juror, I have never done this nor do i want to with 2 Small kids in school 1 is a half day and a husband who is in the military plus we are moving 2 months after the date of summons. I can excuse this but i just don't know how to make it sound like it is a valid excuse. What are your Opinions on how i should Write it?