The Third Infantry Regiment at Fort Myer has the responsibility for providing ceremonial units and honor guards for state occasions, White House social functions, public celebrations and interments at Arlington National Cemetery. They also stand a very formal sentry watch at the Tombs of the Unknowns. The public is familiar with the precision of what is called. "walking post" at the Tombs. There are roped off galleries where visitors can form to observe the troopers and their measured step and almost mechanical silent rifle shoulder changes. They are relieved every hour in a very formal drill that has to be...