Anyway, even if he could requisition vehicles, he can't request warships for the simple fact he's an IG officer, and the IG and Imperial navy are two separate entities that don't take orders from one another. A suposed fail-safe to prevent commanders that
realize the uglyness of the IoM and break freeturn renegade instantly geting control of the nearest fleet.
And that's why guardsmen curse the heavens as they're forced to fight bloody ground battles when some simple warship suport could make their life much easier.
EDIT: On the other hand, sneaking inside a massive battleship, butchering the crew, overloard the reactors and escape as it explodes on the background is precisely the kind of thing Samus does as warm ups.