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The U.S. Army websites provides the oath of enlistment and details about the oath. Websites such as Wikipedia, Military, and wiseGEEK also provide information about the oath of enlistment.
joining the military
Some parts of the medical profession.
The hippocratic oath says "do no harm."
The Veterinarian's Oath is administered to American veterinary graduates when they receive their degrees and are admitted to the profession.
Apply, undergo testing, a background check, physical examination, and if all is well, take the oath of enlistment.
ship, shipmate, self
The oath that all soldiers in the US military make is the Oath of Enlistment or the Oath of Office, depending on their status. The Oath of Enlistment is taken by enlisted personnel and includes a commitment to support and defend the Constitution of the United States against all enemies, foreign and domestic. The Oath of Office is taken by officers and includes a pledge to support and defend the Constitution and to bear true faith and allegiance to the same.
While taking Oath as newly inducted citizens of USA, one has to promise to bear arms in defense of the country if time comes. This promise is unique to USA oath.
Mercenaries fight for the highest bidder and hold no allegiance to anyone; they are private businessmen. An all volunteer army is sworn under oath to defend it's nation, and is a "profession", just like the medical field, engineering field, legal field, manufacturing field, sales, etc. The Soldiers and Sailors (and Airmen & Marines) are employed in the "profession of arms"; the field of military science.
The social institution that requires its members to take the Hippocratic oath is the medical profession, specifically physicians, before they start practicing medicine. The oath is a pledge to uphold ethical standards, promote patient well-being, and maintain confidentiality.
Several words have something similar to this definition. Oath, vow, pledge, profession, and contract are all examples of words with this meaning.