(San Diego, CA)  --  The San Diego Chargers are leaving their normal practice fields behind later this week for a special encounter with Navy families .  The Chargers will hold a practice aboard the USS Ronald Reagan aircraft carrier tomorrow morning on the flight deck in front of dozens of Naval officers and their families.  The unusual practice will come one day before the Chargers take part in the 25th annual Salute to the Military preseason NFL game against the San Francisco 49ers.