I hate to say this, but the USA Normandy landing casualties would have been considerably less if they had listened to the British intelligence.
A large number of US troops were lost before they ever got to land, because the US generals refused to believe the UK intelligencers that the beach was much farther inland than the US intelligencers stated. Many were lost getting out of the amphibious craft, still in 20ft of water.
I was lucky - my great uncle was one of those back on the British shore, waiting. If the landings had been a failure, he would have been in the next wave. They weren't and he - and we - lived.
I've raised a glass for them, and will be in Ypres later this year to remember them properly. 60 years is too far away to remember but too recent to forget.
At the going down of the sun, and in the morning.... we will remember them.