Reservists called to 'half-day' duty Published Aug. 13, 2007 DENVER -- The Air Reserve Personnel Center will conduct a muster for nearly 145 Individual Ready Reservists on May 18 and June 22 from 9 a.m. to 1 p.m. at the Air Reserve Personnel Center here. The IRR Muster Program exists to enhance readiness and ensure the Air Force can "reach out and touch" the IRR population when called upon to do so. IRRs are primarily Airmen who have served on active duty but still have a military service obligation to the Air Force. In war and other times of crisis, it is sometimes necessary to call up the IRR. To ensure the call up works when needed, the Air Force holds a muster. Because of significant volunteerism, the Air Force Reserve has not had to mobilize the IRR since Operation Desert Storm. "Let me stress that this is not a mobilization, it is simply a muster. These musters provide the overall structure to gather and maintain IRR member contact and physical condition information, increasing efficiency in the event an activation or mobilization becomes necessary," said Col. Ann Shippy, ARPC Commander. Annually, for about four hours, IRRs are told to report to an Air Force base, usually within 150 miles of their residence. Upon arrival, information on their records is updated, they receive a basic medical screening and several briefings. At the end of the muster, the IRRs are paid for their time and are free to leave.