From Halopedia, the Halo wiki
The Spartan Creed is an oath taken in the Spartan branch of the United Nations Space Command's Armed Forces. It was recited by service members upon their graduation into the SPARTAN-IV program. Chief of Staff of Spartan Operations Jun-A266 reflected on the words of the creed every day.
The creed goes as follows:
|“||We stand committed to excellence in warfighting, integrity of character, and respect for the heritage received from the Spartans who have carried the sword and shield before us.||”|