What are some facts about the Tomb of the Unknown Soldiers?

One fact about the Tomb of the Unknown Soldier is that the tomb has been guarded every minute of every day since 1937. Another is that the guards wear moist gloves to improve their grips on their rifles.

Guards have living quarters underneath the amphitheater steps where they stay during their 24-hour shifts. Guards take 21 steps during their walk across the tomb, which alludes to the 21-gun salute, which is the highest military honor.

For a person to apply for guard duty at the tomb, he must be in top physical shape. He must be between 5 feet 10 inches and 6 feet 2 inches tall, and his waist size cannot exceed 30 inches.