Random facts about the Tomb of the Unknowns

This came via e-mail. Snopes has a some clarrifications (see below).

1. How many steps does the guard take during his walk across the Tomb of the Unknowns and why?
21 steps. It alludes to the twenty-one gun salute, which is the highest honor given any military or foreign dignitary.

2. How long does he hesitate after his about face to begin his return walk and why?
21 seconds for the same reason as answer number 1

3. Why are his gloves wet?
His gloves are moistened to prevent his losing his grip on the rifle.

4. Does he carry his rifle on the same shoulder all the time and if not, why not? He carries the rifle on the shoulder away from the tomb.
After his march across the path, he executes an about face and moves the rifle to the outside shoulder.

5. How often are the guards changed?
Guards are changed every thirty minutes, twenty-four hours a day, 365 days a year.

6. What are the physical traits of the guard limited to? For a person to apply for guard duty at the tomb, he must be between 5' 10" and 6' 2" tall and his waist size cannot exceed 30." Other requirements of the Guard: They must commit 2 years of life to guard the tomb, live in a barracks under the tomb, and cannot drink any alcohol on or off duty for the rest of their lives. They cannot swear in public for the rest of their lives and cannot disgrace the uniform {fighting} or the tomb in any way. After two years, the guard is given a wreath pin that is worn on their lapel signifying they served as guard of the tomb. There are only 400 presently worn. The guard must obey these rules for the rest of their
lives or give up the wreath pin.
The shoes are specially made with very thick soles to keep the heat and cold from their feet. There are metal heel plates that extend to the top of the shoe in order to make the loud click as they come to a halt.
There are no wrinkles, folds or lint on the uniform. Guards dress for duty in front of a full-length mirror.
The first six months of duty a guard cannot talk to anyone, nor watch TV. All off duty time is spent studying the 175 notable people laid to rest in Arlington National Cemetery. A guard must memorize who they are and where they are interred. Among the notables are: President Taft, Joe E. Lewis {the boxer} and Medal of Honor winner Audie Murphy, {the most decorated soldier of WWII} of Hollywood fame.
Every guard spends five hours a day getting his uniforms ready for guard duty.
In 2003 as Hurricane Isabelle was approaching Washington, DC, our US Senate/House took 2 days off with anticipation of the storm. On the ABC evening news, it was reported that because of the dangers from the hurricane, the military members assigned the duty of guarding the Tomb of the Unknown Soldier were given permission to suspend the assignment. They respectfully declined the offer, "No way, Sir!" Soaked to the skin, marching in the pelting rain of a tropical storm, they said that guarding the Tomb was not just an assignment, it was the highest honor that can be afforded to a serviceperson. The tomb has been patrolled continuously, 24/7, since 1930.

Corrections from Snopes:

From 1926 through 1937, the Tomb was guarded only during daylight hours. Ever since 1937, the Tomb has been continuously guarded 24 hours a day, every day of the year. Tomb guards are changed every thirty minutes between 8 AM and 7 PM during the period from early Spring to early Autumn (April 1 through September 30), and every hour between 8 AM to 5 PM the rest of the year. At all other times (i.e., while the cemetery is closed), the guard is changed every two hours.
Even the Old Guard doesn't regulate the off-duty lives of its members so stringently!
Sentinels at the Tomb do not have to commit to serving there for any fixed period of time, and the average tour of duty is only about half the two year period claimed here. Like most servicemen, Tomb guards may live either on-base (at nearby Fort Myer) or off-base in housing of their choosing. There are no restrictions on guards' off-duty drinking.
The Tomb Guard Identification Badge, first awarded in 1957, is a honor for which a guard qualifies by "flawlessly performing his duty for several months" and passing a test, not something simply handed out to everyone who serves for a given period of time.
The 500th Tomb Guard Identification Badge was awarded in early 2002, and the total number of recipients is now about 525. The award is, as its name states, a badge worn on the pocket of a uniform jacket, not a pin worn in the lapel.
Although the claim that guards "cannot swear in public for the rest of their lives" is fallacious, there is some truth to the notion that the Tomb Guard Identification Badge can be taken away, even after the recipient has left the service.
A Tomb guard's behavior is not so stringently regulated that he is prohibited from speaking to anyone for a full six months (someone seems to have confused the Old Guard with a monastery!), and guards may do whatever they want (including watching TV) during their off-duty hours. But since any soldier wishing to become a sentinel must undergo rigorous training, including several hours a day of marching, rifle drill and uniform preparation, and every tomb sentinel is expected to be completely versed in the history of both the tomb and of Arlington National Cemetery (including knowing how to find the graves of all the prominent person buried in the cemetery), they don't necessarily have a lot of free time to devote to recreational activities.
We close here with a bit of trivia suggested by the above item:
Although serving as President of the United States qualifies one to be buried at Arlington National Cemetery, only two former Presidents are interred there — William Howard Taft and John F. Kennedy.