This week marks the 30th anniversary of Argentina's invasion of the Falkland Islands, which sparked the Falklands War.
32 Welsh Guards died when the Sir Galahad was bombed by Argentinian jets.
A senior British officer has told ITV Wales he believes lives were needlessly lost because equipment was unloaded before the Welsh Guards were disembarked.
Ewen Southby-Tailyour was a commanding officer on a landing craft at the time.
"The fact that so many men were killed was totally avoidable" he said.
"And I won't alter that view."