Most of these guys are retired or out of the service, but they still answer the call — for a different kind of duty. Two teams of 27 volleyball players from all over the country will represent the Air Force later this month in a pair of masters division teams at the U.S. Open Volleyball Championships in Louisville, Ky. “Living so far away from each other now, we do not get the chance to practice together,” said James Garrido, the teams’ representative and former staff sergeant who hails from Savannah, Ga. “Most of us have played together on past Air…