Robbins’ coffin is transported to Chapel Hill Cemetery outside Denver on Sunday, April 4, 1965.

APR 3 1965, APR 4 1965 COFFIN OF BARBARA ROBBINS, 21, IS CARRIED TO HEARSE AFTER SERVICES IN DENVER SATURDAY Some 325 relatives, friends and neighbors paid respects to secretary killed in bombing of U.S. Embassy in Saigon. Credit: Denver Post (Denver Post via Getty Images)

Robbins’ coffin is transported to Chapel Hill Cemetery outside Denver on Sunday, April 4, 1965. About 325 family members, friends and neighbors attended the services. On April 3, a service honoring Robbins and a sailor killed in the blast was held in Saigon. (Denver Post via Getty Images)

Denver Post via Getty Images