Welcome to the ADVANCED POLICE TRAINING instructor information page. We are the premier provider of basic to advanced training. Our goal is to provide the very best in training, certification, and knowledge as it relates to real life situations. Because our quality control standards are high, our instructors are among the best in the business. Our goal is to always deliver the best real life training available. We want you, our valued customer, to be happy. Here is a short list of our instructors.

William J. Trussell, of Advanced Police Training, LLC, has been a sworn police officer for 18 years, and has worked in various assignments such as patrol, bicycle patrol, criminal investigations and SWAT. He has taught basic to advanced tactics and principles for both patrol and swat officers to include small arms, structure clearing, formations, less lethal, close quarter combat, and more. He is an established and recognized 19 year martial arts instructor in Aikido, and Kali, teaching classes to law enforcement and the private sector. He has taught Defensive Tactics and Oleoresin Capsicum at the Mississippi Law Enforcement Training Academy in Pearl, MS, and Defensive Tactics at the Lincoln County Sheriff's Reserve Academy. He was his departments training officer for 5 years responsible for training and certifying officers in defensive tactics, Oleoresin Capsicum, IPMBA, and Active Shooter Response. In January 2008 he stepped down from full time service to a part time position in order to work for a private company teaching the U.S. Navy Expeditionary Combat Skills. He has currently instructed over 10,300 U.S. Navy Personnel while working for the company as a Fire Arms instructor, Combat Life Saver Instructor, and Land Navigation Instructor. He is a registered NRA Range Safety Officer, and a NRA Small Arms Instructor able to instruct and certify pistol, shotgun, and assault rifle. He is also a certified U.S. Navy and Marine Corps SAMI (small arms marksmanship instructor)

Lamar Underwood is currently a detective with the Pascagoula Police Department and has been a sworn officer for 13 years. Throughout his law enforcement career he was assigned to the Narcotics Task Force of Jackson County for four years where he worked in an undercover capacity. He was appointed to the rank of Sergeant while assigned to the task force, and upon leaving was promoted to the rank of Lieutenant where he held that rank for three years. He was assigned to a bike patrol unit while employed with the Moss Point Police Department where he received his IPMBA certification. He is a certified instructor in Subject Control Systems. He has attended numerous training courses from RCTA (Regional Counterdrug Training Academy) in Meridian MS and APT (Advanced Police Training) in Biloxi, MS. He has worked with several federal agencies to include the FBI, DEA, US Marshal’s, ATF, US Customs & Border Control, NCIS and Immigration.

ADJUNCT INSTRUCTOR: Linda Davis holds a Doctor of Jurisprudence (J.D.) degree from Mississippi College School of Law.
She served as a criminal prosecutor with the Mississippi Attorney General’s Office for fourteen years. During her tenure with the Attorney General’s Office she served in: the Public Integrity Division, CyberCrime Unit, prosecuting crimes involving the exploitation of children; the Prosecutors’ Training Division providing legal training to law enforcement officers across the State; and the Consumer Protection Division where she prosecuted fraud cases and advocated for the public. Prior to that, she served in the Office of the Senate Chief Counsel for Employment at the United States Senate in Washington, D.C. and at the United States Court of Appeals for the Federal Circuit in Washington, D.C.