De oppresso liber

De oppresso liber is the motto of the United States Army Special Forces.
Meaning.
United States Army tradition.
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.
Actual translation.
A correct translation of the Latin phrase "de oppresso liber" would be "from (being) an oppressed man, (to being) a free one".
Grammatical structure.
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".
Similar phrases.
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".
Lineage.
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.
Sculpture.
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 statue was dedicated on November 11, 2011 in a ceremony led by Vice President Joe Biden and Lt. Gen. John Mulholland, commander of Special Operations Command.
Legacy.
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.