Mortars? Try an M1 main battle tank. It's a bit louder.
Not mortars (those are 81mm) but HEAT rockets... way louder. Not as loud as an M1A1 by a long shot.
FWIW I do wear a seatbelt in my car... but I don't require or mandate said behavior for anyone over 18 who rides in it... your life, your choice.
Are you going to stop in the middle of combat to emplace ear plugs? Do you Stalk an animal in the brush with ear plugs in?
You can have your churches, I'll keep my guns. Just keep your hands off my paycheck and your eyes out of my backyard.
Join the Libertarian Party! http://www.lp.org