Kelvin has over 20 years of law enforcement experience, he's been a lead firearms and tactics instructor for over 15 years with the Texas Department of Public Safety. Kelvin has provided instruction to various local, state, and federal agencies, as well military personnel. He has several certifications in firearms and tactics along with armorer certifications. He served 8 years in the United States Army. He is a Master Class competitive shooter and an active member of the following professional organizations: National Rifle Association (NRA), Texas State Rifle Association (TSRA), and the Texas Tactical Police Officer Association.