1981 - Dr. Robert Grappendorf served as a dentist in the refugee camps in Hong Kong for one month.

2004 - Corliss & Jeanne Klaassen went to India for a National Immunization Day (NID) for polio eradication. 

2007 - Corliss & Jeanne Klaassen went to Nigeria for a National Immunization Day (NID) for polio eradication.