ASHBURN, Va. -- When Robert Kelley showed up a few pounds heavier after his red shirt year at Tulane, running backs coach David Johnson gave him a backpack with Fat Rob inscribed on it, and the nickname stuck.More of a moniker among friends than anything else for several years, Fat Rob resurfaced when Kelley joined the Washington Redskins in training camp. The undrafted free agent is now going into his third game as the Redskins starting running back Sunday night against the Green Bay Packers.He earned the spot by being Positive Rob.Usurping Matt Jones as the No. 1 back, Kelley has stabilized the offense by holding onto the ball and seemingly always getting back to the line of scrimmage if not much further.There arent many negative plays with Robert, coach Jay Gruden said. You stay on track as a play-caller, and it makes the game flow a lot smoother when youre in second-and-7, second-and-6, second-and-5, and thats a great tribute to him. Hes a hard runner.Kelley isnt flashy, but hes effective. Since taking over the starting role Oct. 30 against the Cincinnati Bengals, 39 of his 43 carries have been for positive yardage, with just one loss and three for no gain.Kelley takes great pride in that stat.Thats how I run the ball, Kelley said. Im not one of (those) guys that sits back all day and just try to dance around. I try to get north and south as much as possible.Gruden said Kelley putting the Redskins in manageable down-and-distance situations means your whole playbook is open and allows quarterback Kirk Cousins to freeze defenders with play-action. It worked in a 26-20 victory over the Minnesota Vikings when Kelley ran for 97 yards.It does make a difference and keeps our offense going in a positive direction, Cousins said. The play-action game can be effective for us.Because third-down back Chris Thompson is a capable receiver out of the backfield and the change-of-pace runner, Kelley doesnt have to try to do too much -- just hold on to the ball. While Jones lost the job in part because of his fumbling problems, Kelley has yet to fumble in 60 NFL carries.Success has come quick for the 24-year-old from New Orleans, so much that he doesnt believe it. When Jones hurt his shoulder during the preseason, Kelley was reluctant to say if hed be able to carry the load as the starter.When Kelley learned from Gruden last month that he was being named the starter, he tempered his excitement and was determined to make the coaching staff proud. Hes in the midst of doing just that, but he didnt expect to be a pro starter this quickly.Im always surprised, he said. I always try to take advantage and dont just go out there and get big-headed and stuff like that.Far from becoming over confident, Kelley continues to study film in the hopes of improving. He saw cuts he missed against the Bengals and worked to not make the same mistakes in his second start.He said some of his biggest runs have come on off-schedule plays, but he hasnt yet broken off anything longer than 18 yards. Kelley considers cohesion with the offensive line the next step in his progression.Just keep constantly showing my guys I trust in them -- the front line, the front five -- and make those guys look better, Kelley said. They also try to make me look better. They make holes for me that I dont have to do too much to get through and stuff like that. We kind of work together and try to build that chemistry with those guys.NOTE: WR DeSean Jackson was a limited participant in practice Wednesday because of a left shoulder injury. 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LAS VEGAS -- The U.S. Olympic basketball teams will host more than 350 family members of military who have died during their upcoming exhibition tours.USA Basketball announced a partnership with the Tragedy Assistance Program for Survivors (TAPS) on Wednesday, two days before its mens team begins its pre-Olympic schedule with a game in Las Vegas against Argentina.Events will also be held surrounding mens games in Los Angeles, Chicago and Houston, and a womens game in Bridgeport, Connecticut.Besides tickets to the events, USA Basketball will have more than 75 surviving milittary children serve as ball kids and stand with players during national anthem performances.ddddddddddddTAPS was founded in 1994 to provide free support services to surviving Armed Forces family members. The Americans have strengthened their relationship with the military under USA Basketball chairman Jerry Colangelo and coach Mike Krzyzewski, a graduate of the U.S. Military Academy, visiting bases and taking part in other activities with troops. ' ' '