United Technologies Corporation (UTC) provides high technology products and services to the building systems and aerospace industries worldwide. The Company operates in six segments: Otis, Carrier, UTC Fire & Security, Pratt & Whitney, Hamilton Sundstrand and Sikorsky. Otis, Carrier and UTC Fire & Security serve customers in the commercial, government infrastructure and residential property sectors worldwide. Carrier also serves commercial, industrial, transport refrigeration and food service equipment customers. Pratt & Whitney, Hamilton Sundstrand and Sikorsky primarily serves commercial and government customers. In May 2013, the Company announced that it has completed the divestiture of its Pratt & Whitney Power Systems unit to Mitsubishi Heavy Industries Ltd (MHI). In June 2013, United Technologies Corp announced it has closed on the sale of substantially all operations of its Pratt & Whitney Rocketdyne unit to GenCorp.