The tinnitus ringing sound effect from being near explosions is a realistic feature in the game, but it is very unpleasant. After several games I find myself considering just playing the game with no sound because of how irritating it is to my ears. The option to toggle this ringing sound off would be very appreciated.
To avoid giving people without the sound a gameplay advantage it may be a good idea to replace the ringing sound with a significant reduction in all game sound. This would mimic the effect of the soldier no longer being able to hear anything after a nearby explosion.