Air Force General (four star) Jorge Rojas Ávila heads the 12,500 strong Chilean Air Force. Air assets are distributed among five air brigades headquartered in Iquique, Antofagasta, Santiago, Puerto Montt, and Punta Arenas. The Air Force also operates an airbase on King George Island, Antarctica. The Air Force took delivery of the final two of ten F-16s, all purchased from the U.S., in March 2007 after several decades of U.S. debate and previous refusal to sell. Chile also took delivery in 2007 of a number of reconditioned Block 15 F-16s from the Netherlands, bringing to 18 the total of F-16s purchased from the Dutch.