Bill Allen, of Winthrop, Mass., who served in the Army in Vietnam during 1971, was one of the volunteers planting American flags on Boston Common Wednesday, May 26, 2021, in Boston. Each year before Memorial Day weekend the Massachusetts Military Heroes Fund places a flag to represent every fallen member of the U.S. military from Massachusetts since the Revolutionary War. (AP Photo/Josh Reynolds)

Bill Allen, of Winthrop, Mass., who served in the Army in Vietnam during 1971, was one of the volunteers planting American flags on Boston Common Wednesday, May 26, 2021, in Boston. Each year before Memorial Day weekend the Massachusetts Military Heroes Fund places a flag to represent every fallen member of the U.S. military from Massachusetts since the Revolutionary War. (AP Photo/Josh Reynolds)