Former President Bill Clinton will visit the White House this week to join President Barack Obama in celebrating the 20th anniversary of AmeriCorps. Clinton and Obama will address a group of hundreds of Americorps volunteers on the South Lawn as they are sworn in for duty on Friday, officials said Tuesday.

Clinton organized the first group of AmeriCorps volunteers in September 1994.

The White House address will kick off an entire year of national service for roughly 75,000 volunteers who have agreed to spend the next 12 months providing services through AmeriCorps. The event in Washington is one of dozens of ceremonies being held across the country Friday.

Along with the founding and current presidents, Former President George H.W. Bush is set to take part in a ceremony at his home in Kennebunkport, Maine. Another member of the political family, Former President George W. Bush along with his wife, Laura, have made a recorded video that will be presented at many of the ceremonies.

Each year, AmeriCorps sends tens of thousands of volunteers around the U.S. to partake in service projects that range from education to community development to technology innovations. These individuals work in schools, religious-based groups or nonprofit organizations, among others.

The four former presidents involved in the ceremonies each contributed to the institution and expansion of AmeriCorps. George H.W. Bush signed the 1990 National Service Act, which paved the way for the service program, which Clinton signed into legislation in 1993. Following him, George W. Bush expanded the number of AmeriCorps positions following the 9/11 terrorist attacks. Obama has carried the torch by further expanding partnering agencies such as FEMA Corps, STEM AmeriCorps and School Turnaround AmeriCorps.

Since the first class of 20,000 volunteers began the program in 1994, there have been more than 900,000 AmeriCorps participants logging over 1.2 billion hours of service, according to the Corporation for National and Community Service.