Sidney T. Weinstein was a United States Army lieutenant general.

From 16 August 1985 to 30 September 1989, Weinstein, then a lieutenant general, served as the Deputy Chief of Staff for Intelligence, Headquarters, Department of the Army.

Although diminutive in height, Weinstein possessed a larger-than-life personality; one of his trademarks was a penchant for creative profanity.

Upon his retirement, Weinstein became a senior executive with Electronic Warfare Associates in Chantilly, Virginia.

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