Have you guys ever noticed.... that no one ever says "what?" in war movies? There can be... 10,000 people firing assault rifles at once, 50,000 tons of explosives being detonated, 54 super sonic aircraft flying past 300 feet off the ground, 18 cannons going off, a calvary charge, a ford mustang turning over, 60 helicopters crashing simultaneously and yet..... everyone hears everything that everyone else says.
Even over 1940's WWII radios... no one ever has to repeat themselves, unless (obviously) if they're in some form of dispute with their superior officers and need to say what they've just said louder to make sure they know how upset they are.
Otherwise... the conversation is pristine.
My family has terrible hearing. If someone turns on the garbage disposal, no one can understand anything that anyone says on that floor of the house until its turned off. "What" is clearly, definitively, the most common word in our house.
Has anyone. Ever. Seen a war movie where the soldiers cannot hear and/or understand one another over the ungodly racket going on around them???
I submit to you, that none of you have.