USA-227, known before launch as NRO Launch 27 (NROL-27), is an American communications satellite which was launched in 2011. It is operated by the United States National Reconnaissance Office. Whilst details of its mission are officially classified, amateur observers have identified USA-227 as being a third-generation Satellite Data System satellite in geosynchronous orbit. The first amateur observation of the satellite was made on 6 April 2011, when the spacecraft was located at a longitude of 30.4 degrees west. SDS satellites are used to relay data from American reconnaissance satellites to ground stations.