The American military presence in Taiwan consisted of the Military Assistance Advisory Group (MAAG) and the United States Taiwan Defense Command (USTDC). Other notable units included the 327th Air Division. Until the US formally recognized the People's Republic of China in 1979, Washington provided the ROC with financial grants based on the Foreign Assistance Act, Mutual Security Act and Act for International Development enacted by the US Congress. A separate Sino-American Mutual Defense Treaty was signed between the two governments of US and ROC in 1954 and lasted until 1979.