Subject Keywords: Groups, Alan B. Shepard, Space, Donald K. Slayton, 1950s, Leroy G. Cooper, American, Walter M. Schirra, John H. Jr. Glenn, Personnel, Virgil I. Grissom, Malcolm S. Carpenter, John H. Jr. Glenn, Leroy G. Cooper, Space, Personnel, Walter M. Schirra, Donald K. Slayton, American, Malcolm S. Carpenter, Groups, Alan B. Shepard, Virgil I. Grissom, 1950s