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Regarding Ross's attempt to capture Bruce at Culver University, why did he order such a horribly un-stealthy plan? The general certainly prepared in terms of weaponry for a Hulk encounter, but not for trying to avoid the Hulk at all. If he was trying to capture Bruce quickly and quietly, wouldn't it have been a lot smarter for him to send an undercover team posing as teachers/students to take him by surprise? If Bruce struggles, they could remind him that he's in a building full of innocent civilians and thus make him unwilling to transform. Then they could sedate him to take him out of the school and to a secure site. Even if Ross's "send ALL the soldiers!!" plan had worked, he would have still had to deal with the publicity of soldiers rushing through the school and jeeps smashing through parked cars.
"Make him unwilling to transform" is meaningless. Bruce is always unwilling to transform. And you're presuming that Ross knows intimately what makes Bruce transform—all he likely knows is that when Bruce is mad or agitated, he turns into a big green monster. The plan seemed to be to throw the gas in and sedate him before he could do anything.
Ross said himself in Brazil that Bruce wants to be left alone. He also saw in the chase that it took a relatively long time for Bruce to transform and he ended up being forced to. That's a hint that with enough speed and stealth, they could quietly sedate Bruce rather than create a situation where he's guaranteed to be agitated.
Just because we saw it clearly doesn't mean Ross was able to put the same things together just as clearly. Remember also that your knowledge of what seems logical is tainted by the additional information you have that he doesn't. It's also not taking into account that a man whose nickname is "Thunderbolt" is probably not a model of self-restraint and subtlety anyway. He's doing what his character always has done... poking a sleeping dragon in the eye and saying "Hey. Quit it."
General Ross's goal was to take out Banner before he hulked out. Presumably he brought all the extra artillery just in case, and it turns out he needed it, because (as he mentions) "someone showed their hand early".
Why are the soldiers in this movie wearing BDU instead of ACU? The U.S. Army retired the BDU entirely before this movie was released, and it seems unlikely that the ACU would be unavailable to the studio, or that General Ross and his forces would be using uniforms that were on the verge of being retired. It makes even less sense if this movie is supposed to take place (at most) a few years before The Avengers, where we see soldiers in ACU during the battle of New York.