I am reading an account of the Omaha Beach Landing by the US 1st Infantry Division, primarily the 116 Infantry Regiment.
The repeated comment by the individual Soldiers is how burdened they were with extra equipment, arms, explosives, and ammo to the extent they were unable to move with any speed or agility much less swim.
That was one of the criticisms about the Somme Attack.
Here we are today with our guys loaded down with Body Armor and all sorts of gear that, yes, slows them down and hampers their movements.
No, Lessons are always forgotten. Soldiers die because of it.