Cessation of operations by land and in the air six hours after the signature of the armistice.
Ninety years ago, an armistice was signed that ended combat in the First World War. One year later, November 11th was celebrated as Armistice Day. Two wars later, the day became known as Veterans Day.
Veterans are like mothers. Nowadays, some people are both. Often, people become veterans or mothers through the failure of diplomacy or contraception. But you don't have to be one to honor them.