I'll simply offer some advice around options in the Netherlands and the EU in general, disregarding what has already been stated to you regarding finances. I was stationed in Germany from 1998 - 2000 and bought a new truck and a Harley through military sales. I'd encourage you to check out
http://www.encs.com/ as that's the current link you can get to see what US spec vehicles are available for purchase at various locations throughout the EU to military members. I only suggest looking there because they are bound by contract to sell at discounted prices and all the vehicles are US spec so if you do end up in the three years and back stateside, you're not holding onto a car that you can't sell on the local economy easily.