Marines perform maintenance on an MV-22B Osprey aircraft in a hangar at Camp Bastion. Marines from Marine Medium Tiltrotor Squadron 264 perform maintenance on an MV-22B Osprey aircraft in a hangar at Camp Bastion, Afghanistan, on June 16, 2011. In 2007 the Osprey began replacing the CH-46 Sea Knight helicopter, which had been in service since 1962. SHARE: Download: Full Size (0.04 MB) Credit: VIRIN: 355077-Y-BNS83-039.jpg Photo Gallery