De oppresso liber

De oppresso liber is the motto of the United States Army Special Forces.

United States Army tradition
It is United States Army tradition that this phrase in Latin is considered to mean "to free from oppression" or "to liberate the oppressed", in English. However, a translation of "to free from oppression" would be de oppressione liberare. Similarly, "to liberate the oppressed" means oppressos liberare.

Actual translation
Possible translations of the phrase de oppresso liber are: "a free (man) out of an oppressed (man)" (close to "freedom out of oppression"), "free from having been oppressed", "out of the overthrown (man), the free (man)."

Grammatical structure
The structure resembles that of the motto "E pluribus unum". The preposition de with the ablative case, however, cannot express the idea of an ablative of separation, which one would expect from either the ablative by itself or 'ex' or 'ab' with the ablative. The word de denotes, instead, not separation from, but a source in the oppressed. The word liber means not the verb "to free" but simply the adjective "free", which, in the masculine singular form here used, may be interpreted as a noun, meaning "a free man"; while "oppressus" is not the noun "oppression" but the adjective "overthrown."

Similar phrases
The motto resembles the following St. Augustine quote:

See also Isaiah 1:17:

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. It 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.