As the United States involvement in Afghanistan winds down, and in the aftermath of the protracted occupation of Iraq, it is as meaningful as ever for Americans to reflect on the contributions of those who wear this country’s uniforms. Monday’s East Hampton parade will stop traffic on Main Street for a brief time, the temporary silence a tribute in a small way to those who never made it home. This year, too, we will think of three men, two who were killed in combat and one who, though not veteran, touched the lives of many who were.