Waco: military memo of FBI meeting with Janet Reno
Before authorizing the gassing at Waco, Janet Reno received a briefing, and she or someone else requested that military advisors be present. The advisors chosen were reluctant to advise a law enforcement operation, but had little choice.
Here's the memo they made of the meeting. The civilian experts were quite unconcerned about the effects of the gas; the military advisors were far more concerned. Reno then asked "why now," and the FBI grossly misled her. Koresh had in fact said he would be coming out as soon as he finished writing the "little book" (too complex to explain here). The FLIR infrared had shown the Davidians were about out of water anyway (it was stored in big plastic tanks outside the building). As far as HRT suffering from lack of training, the military advisors had the simple answer: just pull them back for training. (FBI also had many of its SWAT teams manning the perimeter). There's also a mention of some military equipment (name and nature redacted) that was deployed to Waco.