From Airforce Magazine: http://www.airforce-magazine.com/Pages/HomePage.aspx
Osprey Basing Plan: The bed down of CV-22 Ospreys at RAF Mildenhall, England, has "slipped to the right a little," due to the enduring requirement for these tilt-rotor aircraft in Afghanistan and additional issues like a still-maturing support infrastructure, said Lt. Gen. Eric Fiel, Air Force Special Operations Command commander. "It's just part of the normal growing pains as you bring a new weapon system on the battlefield," Fiel told the Daily Report in an interview. He added, "It's not an issue with the airplane, or with the people, or with spare parts. It's just that every time you set up a new location, you split your experience base." The initial basing plan had called for Ospreys to begin arriving in England in this fiscal year and then in the Pacific shortly after that. Fiel said the first birds still are expected to arrive at Mildenhall within the next year and then in Japan the following year. AFSOC already has a detachment at Mildenhall and construction of Osprey facilities there is under way. Of the 50 Ospreys that AFSOC intends to procure, 23 are already in the inventory. The goal is to have a squadron of seven aircraft for training at Kirtland AFB, N.M.; 10 at Cannon AFB, N.M.; a squadron of 10 aircraft at Hurlburt Field, Fla.; 10 at Mildenhall; and 10 at Kadena AB, Japan. Hurlburt also will receive three more CV-22s, including one test aircraft and two that will be assigned to the weapons school.