We are the Premiere Choice for Your Security. JCJ National Security, or JCJ as we are more commonly known, is nationally renowned security firm with a laser focus on just one thing. Your security. At JCJ we specialize in being the most well-rounded, finest trained, and most importantly, the most professional customized comprehensive security for all needs. With an extensive background in a myriad of situations, circumstances, events and industries, JCJ provides best of breed security. We are recognized as the security provider of choice for Denver, Colorado and the entire Rocky Mountain Region.