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GOLF COMPANY - Scott Pelley spends time with a U.S. Marine company in Helmand Province, sent there as part of President Obama's troop buildup in Afghanistan. Henry Schuster is the producer. A BLOW TO THE BRAIN - New studies show that athletes, especially professional football players, who suffered many blows to the head, became brain damaged. Bob Simon reports . Catherine Olian and Michael Radutzky are the producers. THE BIRDMEN - In the latest craze that has killed several extreme adventurers, men don wing suits, jump off mountain tops and glide at speeds of 140 miles per hour. Steve Kroft reports. Tom Anderson is the producer.