Is saving private ryan based on a true story?

The World War II drama Saving Private Ryan still holds up as one of the most celebrated war movies ever made. But is it based on a true story?
Variety

‘Saving Private Ryan’: How Steven Spielberg’s Handheld Techniques, Low Angles and Blood Splatters Changed Hollywood Action Sequences

For 23 minutes, Steven Spielberg’s “Saving Private Ryan” drops audiences into the D-Day landings at Omaha Beach. Handheld cameras and low angles follow Captain John Miller (Tom Hanks) and his squadron ...