The Chargers want to retain Vincent Jackson, but they are reluctant to franchise the wide receiver. It would cost San Diego nearly $13.7 million to place the franchise tag on Jackson. Otherwise, he will become an unrestricted free agent March 13, allowing him to negotiate and sign with another team. While retaining Jackson is considered a top priority for general manager A.J. Smith, sources said Smith is "extremely uncomfortable" allocating that much money to a one-year guaranteed deal.