Sentinels strive for perfection in every step and take their duties very seriously, Griffith said, staying focused despite what's going on in the crowds watching the ceremonies. Some of his most touching moments always occurred later in the evening when one or two people came to the tomb, many breaking down in tears.

Sentinels strive for perfection in every step and take their duties very seriously, Griffith said, staying focused despite what's going on in the crowds watching the ceremonies. Some of his most touching moments always occurred later in the evening when one or two people came to the tomb, many breaking down in tears.