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The sound of the approaching German Tiger was accurate enough to give many veterans in the audience flashbacks.
There's also the scene where Mellish gets into a hand-to-hand fight with an SS soldier, and loses by getting stabbed in the chest by a combat knife. Slowly overpowered, the knife slowly sinking into his chest until he bleeds to death.
More so if you understand German, as the SS soldier is, with a slight mocking tone, telling Mellish to stop struggling so that his death will be easier.
Even worse an armed Upham was just a few meters away hearing them struggle but too frightened to go help and that Mellish was also desperately calling the other guy who was with him for help, not aware that he was already dying / dead.
Oh, and that "other" guy? He's trying to breathe through a throat that just got shot open by a machinegun
Any of the battle scenes in the film could qualify. They did a really good job of showing you how scary and dangerous battlefields are.
Several men in the underwater bit of Omaha actually drowning in the water due to their gear packs weighing them down, many drowning while trying to get them off.
James "Scotty" Doohan, D-Day vet who lost a thumb and was shot during the operation, in an interview, when asked about the opening sequence remarked simply "Yes, that's exactly what it was like." Well... Fuck.