Well, if there was scuba gear or a frogman suit, basically anything that allows individual troops to go underwater for long periods of time, the water needs to be more murky or dark. As it is the water is completely seethrough to the bottom really, and in rivers that is just preposterous, you can't see to the bottom of a river over 2 or 3 feet deep. My point is if you could see a squad of enemy troops clearly coming up the river from the coast then your squad could just start at them and it would be like a shooting gallery even if the physics of water are taken into account. The squad in the river would have definitly decreased mobility and their guns might not work in the water instead of gaining an advantage this squad has put itself in a very vulnerable position. In order to take them by surprise the water must be less translucent.
There should also be guns that work in the water and but most normal guns shouldn't.
Just some thoughts.
Spydy
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