the very first experiment—the legend of the Jet Assisted Take-Off Chevy Impala. Gates died in a construction accident unrelated to rocketry on December 20, 2009, at the age of 47. The episode Mini Myth Mayhem was dedicated to his memory. : Sgt. J. D. Nelson is the Alameda County sheriff sergeant and EOD team leader who appeared in the myths Exploding Pants, Dynamite Paint Job, and others. "JD" supervises the use of the Alameda County Sheriff Office's bomb disposal range in Dublin, California for many of the explosives episodes. : Initially introduced as Sgt. Alan Normandy, and now a South San Francisco police lieutenant and court-certified firearms expert, he appeared in the myths Blown Away, Finger in a Barrel, Catching a Bullet in Your Teeth, Bullets Fired Up, Mega Movie Myths, Firearms Folklore, Myths Revisited, Exploding Tire of Death, Killer Cigarette Butts, and others. Lt. Alan Normandy frequently assists the MythBusters by supplying modern firearms—including fully automatic weapons—to evaluate myths and legends about guns. A 29-year Police Veteran, Chief Firearms Instructor, former SWAT Officer and Police Sniper, Alan often assists the MythBusters as a Range Safety Officer, and also provides some legal and firearms expertise. A regular guest and often referred to as an "old friend," Alan has been a consultant to the production even before the first episode aired. : Dr. Roger Schwenke is an acoustician for Meyer Sound who appeared in the myths "Does a Duck's Quack Echo?", "Brown Note", "Breaking Glass", and "Sounds Bogus". He was called an Honorary MythBuster by Adam in the "Breaking Glass" myth. He also helped bust the "Does a Duck's Quack Echo?" and brown note myths as well as demonstrating how to shatter glass using only sound waves. : Sanjay Singh was an emergency medical technician who appeared in the episodes Poppy Seed Drug Test, Myths Revisited, Exploding Pants, Pirates 2, and others. He worked in Alameda County and was on several episodes of MythBusters beginning with the third episode until his death in 2010. He provided first aid back up to the show's hosts. The episode Storm Chasing Myths was dedicated to his memory. : Dr. Stephen C. Smith is an aeronautic engineer that provided expertise on the Concrete Glider episode, the "Plywood Parachute" portion of the Beat the Radar Detector episode, and the formation flying portion of the Toilet Bomb episode. : Jaime Vendera is an author, television personality and