SEATTLE — Seahawks running back Chris Carson is retiring at the age of 27 due to a neck injury, according to the NFL Network. With the Seahawks reporting to training camp in Renton on Tuesday, the team has reportedly given Carson a failed physical designation and will officially release him. The NFL Network reported that Carson “won’t make a retirement statement, just in case his neck dramatically improves” but the expectation is he will not be able to play again. The NFL Network reported that designation will allow Carson to receive “several million” in injury protection benefits. Carson had …