[James Adams, the senior assistant special agent in charge of the FBI's Dallas office and a former Marine Corps helicopter pilot in Vietnam, had flown up to Perry with the others, and it fell to him to make a decision. He determined that the roof was not suitable for a chopper landing -- there were too many trees and power lines. The best alternative was to use the sheriff's van to transport the prisoner to a helicopter. They could back the van up to a courthouse entrance and walk their man out. But they would have to move fast,] We were concerned about an assault with a rifle, ... And the bulletproof vests that we have don't stop a rifle round. And quite frankly, I didn't think to put a bulletproof vest on him.