The Peace Corps was created in March of 1961 by President John F Kennedy. It develops relationships with lesser developed countries and sends volunteers to these countries to assist with education, health, business, women's issues, etc. These Peace Corp volunteers, acting as American mini-diplomats in a sense, help earn the United States good will.
American taxpayers benefit from this good will through increased national security, and foreign relations. Additionally, the many thousands of returning Peace Corp volunteers (RPCVs) add the knowledge and perspective they gained to U.S. society and the body politic.
In March of 2020, the COVID-19 pandemic caused the Peace Corps to bring home all of its 7,300 volunteers. Two years later, volunteers were once again returned to service, but as you can see from the map, there are many countries (those in green) that do not yet have their volunteers returned.
The Peace Corps budget is fairly stable at an annual $480 million. This is one of the better investments for taxpayers. It buys good will and cooperation at at extremely low cost. But as we've seen recently, that good will can be saboutaged by an administration that cares little about good will, allies, and trading partners.