Always a dilemma if you're organising a milsim event that has waterborne operation component, you'll have to worry about boats to go with it. So that means your vehicle problem gets bigger, you need the wheeled ones for the land-based ops, and of course the boats such as a Zodiac, or resembling one. With the Gibbs Humdinga High Speed Amphibian, your problem gets easier, you can use it on land and on water. The Polaris is a good vehicle to use, but cannot go on water.