As every year around this time, Beau Chêne High School in the city of Arnaudville, Louisiana, held its high school graduation ceremony on May 15. A long-awaited day, when students and their families gather to attend the presentation of diplomas marking a milestone in their lives, took on a bittersweet tone this year. Among the rows of students waiting in uniform, one half-empty chair stood out. Resting on it were the traditional gown and cap wor…