Here is a collection of modern units:
From left to right:
1) Generic attack jeep - I removed the markings, added MG belt, bullets and darkened the soldier a bit.
2) Generic mobile SAM/Missile launcher.
3) Nuclear missile - I adapted this from CTP.
4) Stealth fighter - darkened it all by hand.
5) Stealth Bomber - Enlarged the default one by hand, pixel by pixel
6) Nuclear Submarine - I took an existing model, enlarged it, darkened it, and then re-modeled certain features.
7) Attack satellite
8) Battle Hovercraft
9) Space-age attack plane - I like to refer to it as the Sanger III.