Final answer:
After 1968, the Department of Foreign Missions added a retirement program and a health care plan to better support missionaries, paralleling the broader societal movements for providing safety nets to those in service roles.
Step-by-step explanation:
The changes made by the Department of Foreign Missions to benefit missionaries after 1968 included implementing a retirement program and a health care plan. This attempt to improve the support structure for missionaries is akin to how the Johnson administration created Medicare under the Social Security Act of 1965, which aimed to alleviate the medical expenses of the elderly. The effort to provide better support for missionaries may also reflect the broader social movements toward providing a safety net for various groups contributing to society, including those engaged in missionary work overseas, indicative of a social push for a fairer and safer working and living environment.