Atheists have no shame.
If the atheists don't mind the troopers being honored in some way, then they should leave it up to the families to choose the symbol. The honor is about the troopers, not about non-related atheists.
If it comes down to the atheists objecting to tax dollars being used, then they can be reimbursed when the rest of us are reimbursed for government funding of NPR, Planned Parenthood and the lawsuit expenses incurred by idiotic lawsuits started by atheists.