Seems to me there were two military higher-ups who counselled Janet Reno on the use of the CS/Methylene Chloride gas mix, saying it was harmless (even though it was banned for warfare by international convention). Three medical journal articles uncovered by Rep. Sonny Bono's staff in half a day said otherwise, that in enclosed spaces, and especially with young children and elderly, the gas would cause lethal pulmonary edema within 6 hours.
Was Clark one of the advisors? If so, here's the "indirect and fleeting" involvement which led to the deaths of the folks trapped inside.
The two military officers who met with Reno were Schoomaker and Boykin. Don't know if they discussed CS, but from the "can't grade your paper" account, it appears they did not go into much detail.