22 USC 2501 – Congressional declaration of purpose
(a) The Congress of the United States declares that it is the policy of the United States and the purpose of this chapter to promote world peace and friendship through a Peace Corps, which shall make available to interested countries and areas men and women of the United States qualified for service abroad and willing to serve, under conditions of hardship if necessary, to help the peoples of such countries and areas in meeting their needs for trained manpower, particularly in meeting the basic needs of those living in the poorest areas of such countries, and to help promote a better understanding of the American people on the part of the peoples served and a better understanding of other peoples on the part of the American people.
(b) The Congress declares that it is the policy of the United States and a purpose of the Peace Corps to maintain, to the maximum extent appropriate and consistent with programmatic and fiscal considerations, a volunteer corps of at least 10,000 individuals.