GREEN BAY, WI (WHBL) - Training camp begins in earnest today for the Green Bay Packers, as they hold their first practice across from Lambeau Field. And it appears that a young player will get the opportunity to earn a starting job at safety after the Packers released Charlie Peprah on Wednesday.  Peprah had arthroscopic knee surgery after last season, and he said he did not complete the running portion of his physical yesterday. He was expected to compete with second-year pro M-D Jennings and fourth-round rookie Jerron McMillan for the safety spot opposite Morgan Burnett. Peprah spent parts of five seasons with the Packers in two stints since 2006 – and he was a starter for much of the last two seasons. Peprah has seven career interceptions, all in the last two years. He’s not ruling out an eventual return to the Packers. Green Bay cut him in 2009 and brought him back a year later.  Also yesterday, the Packers signed rookie guard Greg Van Roten from Pennsylvania, and  they cut guard Grant Cook, who signed as an undrafted free agent in mid-May.