"Today, sentinels carry the M14 rifle while wearing moistened gloves to protect the Tomb; the gloves allow better handling of the rifle. The M14 is operational. It is the latest in a long line of rifles used by the sentinels.
Today, the M14 is still used as a sniper rifle (M21) by many military units and is the standard ceremonial weapon of the 3rd U.S. Infantry Division (The Old Guard) and the weapon carried by the Tomb sentinels.
When it’s time for the guards to change, a relief commander says, “Pass on your orders.” The current sentinel commands, “Post and orders remain as directed.” The new sentinel then replies, “Orders acknowledged,” and this reverent ceremony begins again with the M14 rifle."
http://www.tactical-life.com/online/exclusives/sentinels-of-the-tomb/ 
"We Also Have Fewer Horses And Bayonets"
Barack Obama