I think one of the entries in the second link above has an error. "1976"?
We honor Helo Attack Sqdrn (Light) 3 crew killed in 1976 crash near Saigon. All died. ADJ2 Henry Goldbin - LA NC, LTjg Arnold Barden - Fort Rosecrans NC, AMS1 Harold Cowen - New Eminence Cem., Mo. Lt. Cdr. Lawrence Cover - Arlington NC #NoVeteranEverDies