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/ Source: Reuters

An unmanned Atlas 5 rocket blasted off from Cape Canaveral Air Force Station in Florida on Thursday with a classified satellite for the U.S. National Reconnaissance Office.

The rocket's manufacturer, United Launch Alliance, shut down its live webcast under a prearranged news blackout ordered by the U.S. military.

While the NROL-33 mission unfolds under a veil of secrecy, the Atlas 5 and its future are the subject of an increasingly public debate. The fact that the launcher uses Russian-made RD-180 engines has sparked questions about the U.S. space effort's reliance on Russian hardware — and calls from Congress for a shift to U.S.-made alternatives.

— Reuters