Posted by Edwina's Secretary:
And no one else involved was ever tried.
From the article:
Calley didn't deny taking part in the slayings on March 16, 1968, but insisted he was following orders from his superior, Capt. Ernest Medina — a notion Eckhardt, the former prosecutor, rejects.

Medina was also tried by a court-martial in 1971, and was acquitted of all charges.

When asked if he broke the law by obeying an unlawful order, the newspaper reported, Calley replied: "I believe that is true."

"If you are asking why I did not stand up to them when I was given the orders, I will have to say that I was a second lieutenant getting orders from my commander and I followed them — foolishly, I guess," Calley said.