Hey !!Of course !!
So when you write a veterans poem you just want to write a little letter about maybe how you feel about what they do to make us safe. This Type of poem doesn't need to rhyme. So include things like this :
I appreciate what you do to keep us safe.
Thank you.
I hope your are healthy and well.
I dislike war because so many people are killed ( that's my opinion. State yours )
I hope this helps and have a wonderful day !!