The Army Marksmanship Team has a sling tutorial. The Army Service rifle team in addition to competing, have the training mission for the Army's Squad Designated Marksman Program. I think that is cool; taking NRA and CMP competitive experience and bringing it back to the benefit of men going into combat, not a new story for sure.
http://www.usaac.army.mil/amu/Servic...vicerifle.html
Post Script: If you look around their site there are some other videos including a demonstration of the Infantry Trophy Team. Their standard of fire is 40 aimed shots in 50 seconds on target at 600 yards. Pretty good shooting!