The manner of death is not an issue, but it is a common misconception that it is.
If his service was quite recent then some may tip up in uniform.
when any members of my trade pass, I am informed and email the association as well as placing a post on the Association facebook page. Funeral details are sent out and we will try and meet the wishes of the family, in the past this has meant a Union Flag for the coffin and peak cap or beret. Sometimes it’s just a wreath on behalf of the association.