Medical advances have made bone marrow transplantation the treatment of choice for certain hematologic diseases. For those patients eligible for a marrow transplant only about 30 percent find an HLA-compatible match within their families. Studies indicate that unrelated volunteers are willing to donate their marrow. The National Marrow Donor Program was formed in 1986 as a result of a federal contract. This group is a network of donor centers, transplant centers, and collection centers. The Connecticut Red Cross Blood Services is one of approximately 70 donor centers. Recruitment methods vary with each donor center, depending on the resources available. The Connecticut Red Cross Blood Services has recruited more than 1,000 volunteers for entry into the National Marrow Donor Program.