With the advent of "Rolling Thunder", American airbases and facilities needed to be constructed and manned for the aerial effort. On March 8, 1965, 3,500 United States Marines came ashore at Da Nang as the first wave of U.S. combat troops into South Vietnam, adding to the 25,000 U.S. military advisers already in place. The US Government deployment of ground forces to Da Nang had not been consulted with the South Vietnamese government. Instead the initial deployment and gradual build-up was a unilateral decision by the US government. On May 5 the U.S. 173rd Airborne Brigade became the first U.S. Army ground unit committed to the conflict in South Vietnam. On August 18, Operation Starlite began as the first major U.S. ground operation, destroying an NLF stronghold in Quảng Ngãi Province.