De oppresso liber is the motto of the United States Army Special Forces.
In the United States Army Special Forces, the motto is traditionally believed to mean "to free from oppression" or "to liberate the oppressed" in Latin.
A correct translation of the Latin phrase de oppresso liber would be "from (being) an oppressed man, (to being) a free one".
The preposition de here means "from" in the sense of a change from one status to another, not intending separation from the oppressed, but moving from a source in the oppressed. Compare Ovid Fasti 5, 616: inque deum de bove versus erat, "he had been changed from an ox into a god", or Juvenal 7, 197: fies de rhetore consul, "from an orator you will become a consul". Oppresso is the past participle of opprimere ("to oppress") in the ablative case as governed by de, meaning "an oppressed person". The adjective Liber is in the nominative case, "a free person".
The motto resembles a quote from St. Augustine:corripiendi sunt inquieti, [...] oppressi liberandi, "the turbulent have to be corrected, [...] the oppressed to be liberated". See also Isaiah 1:17: subvenite oppresso, "relieve the oppressed".
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The phrase stems from the exploits of World War II Office of Strategic Services Jedburgh/Sussex Teams operating behind the lines in France. Colonel Aaron Bank, father of United States Army Special Forces, and his teams enabled the French Resistance to grow and oppose the occupying German Army. The unconventional warfare tactics of Colonel Bank differed from the conventional warfare tactics of the rest of the United States Army in that they included clandestine support for one side of an existing conflict and that they were subversive to the Nazi forces in power.
The sculpture America's Response Monument is subtitled De Oppresso Liber. It is a life-and-a-half scale bronze statue located in the West Street lobby of One World Financial Center opposite Ground Zero in New York City. Unofficially known as the Horse Soldier Statue, it is the first public monument dedicated to the United States Special Forces and commemorates the servicemen and women of America's Special Operations response to 9/11, including those who fought in the early days of Operation Enduring Freedom, which led to the initial defeat of the Taliban in Afghanistan. It was conceived by a private citizen, sculptor Douwe Blumberg, and commissioned by an anonymous group of Wall Street bankers who lost friends in the 9/11 attacks.
The distinct unit insignia inspired that of the 65th Airborne Special Forces Brigade of Iran, the establishment of which was assisted by advisors from the John F. Kennedy Special Warfare Center and School before the 1979 Iranian Revolution.