Fricking Motorcycles (or US Cavalry), baby. Bloody fast, and as powerful as a basic rifle squad. The occasional breakdowns are no real problem because... by the time they break down, you're probably there!
Oh, it also seems they're considered wheeled vehicles, meaning the faster you move, the harder it is to hit them. Not positive on this.
US Cav has that pair of BAR's in it that can really pull a boy through. GE MG Motorcycles, though, aren't worth it. They pack the same LMG as the regular MG Motorcycles, and while they can move and fire, they have only three men... making it terribly easy for them to rout and disperse... or be whiped out entirely in one attack.
The scouting abilities of both really add that extra oomph.
Also my two favorite - cheap-but-handy units.
