Those weren't military, they were Feds.
Driving the tanks and the military vehicles along with flying the military helicopter,I doubt it.
jj
The "tank" at Waco was an engineering vehicle. While based on a tank frame it was owned by the DEA.
http://en.wikipedia.org/wiki/M728_Combat_Engineer_Vehicle
The ATF, FBI, and DEA, along with the retired Patton tank based vehicles, have used other former military vehicles like variants of the M113 armored personnel carrier.
http://en.wikipedia.org/wiki/M113#Law_Enforcement
There is no doubt that military were there, however they were "observers" and "advisers". Take that to mean what you will.
http://en.wikipedia.org/wiki/Waco_Siege
The helicopters were listed as National Guard in the above Wiki article. They were acting in a "observer", "support" and/or law enforcement. They were armed with cameras, flash bangs, lights, and shotguns. Standard equipment for observing, except the shotguns which were unlikely to be very effective weapons at the ranges they were likely to be operating. The shotguns were probably a precaution if they had to land (or crash) in a hostile environment.
I'm not taking sides here just pointing out a few things. The FBI, DEA, and ATF are known to own former US military vehicles. The National Guard did show up, but were acting under the control of law enforcement as law enforcement. Calling them "military" or "law enforcement" gets fuzzy real quick.
The National Guard members obviously had military training. I imagine a not so insignificant portion of those law enforcement on the scene were former military. So the question still stands, would former or current military members act in opposition to the Constitution they swore to defend and forcefully disarm the public if ordered to do so?
Getting closer to the topic at hand I told my coworkers that if it came down to Giulliani and Clinton as the two leading candidates in the general election then I would move to Canada. I don't think that Canada's gun laws are any better or worse than the USA, just different. This is especially true since that like the USA each Canadian province, territory, and municipality can and do have certain rules on firearm ownership. I'd just need to choose wisely where exactly I chose to hang my hat. So far it looks like I won't have to move so I canceled my house hunting trip.
I don't think there exists a more firearm friendly nation than the USA. In the USA there are nine guns for every ten people. Depending on whom you ask 1/2 to 2/3 households here have firearms.
If things get too far out of hand I expect that we will have what a friend of mine calls a "reset function" occur. Yes kids, that means armed civil uprising. A wise man once said something like, "The beauty of the Second Amendment is that it won't be needed until they try to take it away."